Double Check Assemblies Supplies & Materials for Landscaping

Create New Account Request an Account

Remember me

Not recommended if on a shared computer

Customer Registration

If you're already a SiteOne Account Holder, you can request Online Access to take advantage of these benefits:

Customer-Specific Pricing
Order History & Invoices
Shopping Lists

Customer Client Estimates
SiteOne eWallet
SiteOne Mobile App

ACCOUNT HOLDERS

Need online access?

If you already have SiteOne Account but need online access, you can get started here.

Get Online Access

NON-ACCOUNT HOLDERS

Need a SiteOne Account?

To get online access, you'll first need a SiteOne Account. You can get started here.

Benefits of a SiteOne Account

Check Pricing and Inventory

See your personalized price and what you local branch has in stock

Shop 5000+ items anytime

Access our full catelogue of products from any device 24/7

Place orders from anywhere

Order online for in-store pickup or job site delivery

Returning Customers

Create New Account Request an Account

Remember me

Not recommended if on a shared computer

Customer Registration

If you're already a SiteOne Account Holder, you can request Online Access to take advantage of these benefits:

Customer-Specific Pricing
Order History & Invoices
Shopping Lists

Customer Client Estimates
SiteOne eWallet
SiteOne Mobile App

ACCOUNT HOLDERS

Need online access?

If you already have SiteOne Account but need online access, you can get started here.

Get Online Access

NON-ACCOUNT HOLDERS

Need a SiteOne Account?

To get online access, you'll first need a SiteOne Account. You can get started here.

Benefits of a SiteOne Account

Check Pricing and Inventory

See your personalized price and what you local branch has in stock

Shop 5000+ items anytime

Access our full catelogue of products from any device 24/7

Place orders from anywhere

Order online for in-store pickup or job site delivery

Returning Customers

Create New Account Request an Account

Remember me

Not recommended if on a shared computer

Customer Registration

If you're already a SiteOne Account Holder, you can request Online Access to take advantage of these benefits:

Customer-Specific Pricing
Order History & Invoices

Shopping Lists
Customer Client Estimates

SiteOne eWallet
SiteOne Mobile App

ACCOUNT HOLDERS

Need online access?

If you already have SiteOne Account but need online access, you can get started here.

Get Online Access

NON-ACCOUNT HOLDERS

Need a SiteOne Account?

To get online access, you'll first need a SiteOne Account. You can get started here.

Checkout as Guest

If you want to check out without a SiteOne Account, be our guest. You can create an online account later.

Checkout as Guest

Benefits of a SiteOne Account

Check Pricing and Inventory

See your personalized price and what you local branch has in stock

Shop 5000+ items anytime

Access our full catelogue of products from any device 24/7

Place orders from anywhere

Order online for in-store pickup or job site delivery

Home
All Products
Irrigation
Backflow
Double Check Assemblies

If you update your home branch it may affect items currently in your cart.

Filters

0 Selected

In-Stock today at

North Chelmsford and Nearby 11
Shipping Available 0
You're shopping North Chelmsford, MA Change preferred branch
- All nearby branches
- Nashua NH #676 9.1 miles
- Woburn MA #111 16.4 miles
- Lexington MA #631 16.6 miles
- Hudson MA #630 17.1 miles
- Haverhill MA #640 17.2 miles
- Leominster MA #722 17.4 miles
- Londonderry NH #587 22.3 miles
- Peabody MA #486 23.9 miles
- Framingham MA #576 24.9 miles
- Boston MA #624 28.3 miles
- Dedham MA #435 29.9 miles
- Milford MA #577 33.0 miles
- Milford MA #652 34.2 miles
- Auburn MA #562 35.5 miles
- Stoughton MA #453 37.5 miles
- Foxboro MA #761 38.3 miles
- Pembroke NH #495 38.5 miles
- Portsmouth NH #446 42.8 miles
- Raynham MA #720 48.3 miles
- Pembroke MA #603 49.1 miles
- Warwick RI #448 61.5 miles
- West Wareham MA #777 67.6 miles
- North Dartmouth MA #487 70.0 miles
- Agawam MA #97 74.2 miles
- South Windsor CT #456 80.8 miles
- Mashpee MA #594 82.0 miles
- Windsor CT #633 84.2 miles
- East Hartford CT #442 87.0 miles
- Portland ME #627 89.1 miles
- Ledyard CT #545 90.4 miles
- South Dennis MA #644 92.1 miles
- Newington CT #599 94.7 miles

Marca

Wilkins 23
FEBCO 20
Watts 9
Apollo 7
Zurn 2

Precio

$1,000-$100,000 25
$200-$499.99 17
$500-$999.99 19

Connection Size

1 in. x 1 in. 10
3/4 in. x 3/4 in. 9
1 in. 8
3/4 in. 7
2 in. 6
1-1/2 in. 5
1-1/2 in. x 1-1/2 in. 4
2 in. x 2 in. 4
1-1/4 in. 3
1 1/2 in. x 1-1/2 in. 2
1 1/2 in. 1
1 1/4 in. x 1-1/4 in. 1

Show All

Connection Type

Fnpt x Fnpt 30
FNPT x FNPT 4

Includes

Ball Valve 11
With Ball Valves 8
Ball Valve & Freeze Sensing Capability 5
Fast Test & Ball Valve 2
Ball Valves 1
Fast Test Cocks 1
Union Ball Valve 1
With Union End Ball Valves 1

Item

Valve Assembly 60
Valve 1

Material

Bronze 36
Cast Bronze 8
Lead Free Copper Silicon Alloy 8
Lead Free Bronze 3
Copper Silicon Alloy 1

Series

350 Series 5
950XLT Series 5
LF850 Small 5
007 4
4A Series 4
850 Small 4
850 Small Series 4
LF007 4
Model 850 4
350XL Series 2
4ALF Series 2
950XL Series 2
950XLT2 Series 2
Top Access 2
Top Access, Fast Test Cocks 2
300XL Series 1
950XLTU Series 1
LF850 Small Series 1
Model 007M1 1
Model 350XL 1
Model 850U 1
Model LF850 1

Show All

Type

Double Check 60

View

Showing 1-24 of 61

1(current)

View

Showing 1-24 of 61

1(current)

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

FEBCO 850 Double Check Assembly w/ Ball Valves 1 in. Bronze w/ Freeze Sensing Capabil...

T1113 | 1 Option

Add to List

3 In Stock 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$636.70
^Each

3 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

FEBCO 850 Double Check Assembly w/ Ball Valves 3/4 in. Bronze w/ Freeze Sensing Capab...

T1112 | 1 Option

Add to List

4 In Stock 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$474.01
^Each

4 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

More Content From SiteOne Experts

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

FEBCO Double Check Valve Assembly Model 850 3/4 in. Bronze With Ball Valves

1112-NLA | 2 Options

Add to List

1 Nearby at Branch #652 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$502.02
^Each

Each (1)

Pallet (162)

1 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 350XL 3/4 in. Lead Free Bronze With Ball Va...

34-350XL | 1 Option

Add to List

1 Nearby at Branch #722 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$406.54
^Each

1 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 350 1 in. Bronze With Ball Valves

1-350 | 1 Option

Add to List

5 Nearby at Branch #486 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$396.38
^Each

5 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 350 3/4 in. Bronze With Ball Valves

34-350 | 1 Option

Add to List

1 Nearby at Branch #630 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$369.73
^Each

1 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

FEBCO Double Check Valve Assembly Model 850 1-1/2 in. Bronze With Ball Valves

1115-NLA | 1 Option

Add to List

1 Nearby at Branch #486 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$1,212.01
^Each

1 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 350XL 1 in. Lead Free Bronze With Ball Valv...

1-350XL | 1 Option

Add to List

2 Nearby at Branch #722 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$482.99
^Each

2 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Watts 007M3 Double Check Assembly w/ Ball Valves 3/4 in. Bronze w/ Freeze Sensing Cap...

T062020 | 1 Option

Add to List

1 Nearby at Branch #630 0 Out-of-Stock

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$595.84
^Each

1 available at this location

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

FEBCO Double Check Valve Assembly Model 850 1 in. Bronze With Ball Valves

1113-NLA | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$516.64
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Apollo 4A Double Check Valve Assembly 3/4 in. Bronze w/ Ball Valves

4A104A2F | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$388.33
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Apollo 4A Double Check Valve Assembly Lead Free 3/4 in.

4ALF104A2F | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$501.38
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Watts Double Check Valve Assembly Model 007M1 1 in. Bronze With Ball Valves

0062306P-NLA | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$430.65
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Apollo Lead Free Double Check Valve Assembly 4A Series Bronze 1 in. w/ Ball Valves

4ALF105A2F | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$597.84
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

FEBCO Double Check Valve Assembly Model LF850 1 in. Lead Free Bronze With Ball Valves

0683040-NLA | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$470.03
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Apollo 4A Double Check Valve Assembly 1 in. Bronze with Ball Valves

4A-105-A2F | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$433.88
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Top Access Double Check Valve Assembly Model 950XLT 2 in. Bronze

2-950XLT | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$1,467.95
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 350 1-1/2 in. Bronze With Ball Valves

112-350 | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$1,097.31
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

FEBCO Double Check Valve Assembly Model 850 2 in. Bronze With Ball Valves

1116-NLA | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$1,674.25
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 350XL 2 in. Lead Free Bronze With Ball Valv...

2-350XL | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$1,282.76
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 950XL 3/4 in. Lead Free Bronze

34-950XL | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$411.27
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.

Available to Order" Available for Backorder from

Add this product to a list selected below. If you dont see the list you want, you can create a new one.

Select a List:

In order to add this item to a list, you will need to create a list. Enter a name for the list below and the selected product will be automatically added to it.

Please Enter List Name.

New List Name

List name already exists. Please enter a new name.

Add to List

List name already exists. Please enter a new name.

Please Enter List Name.

Returning Customers

Sign in to your account

Password

Remember me (Not recommended if on a
shared computer)

Wilkins Double Check Valve Assembly Model 950XL 1 in. Bronze

1-950XL | 1 Option

Add to List

Available by Request i We’ll check stock/substitutes and source this item for you.

Please enter a valid quantity.

Expect delays in receiving full order.

Retail Price

$514.65
^Each

Pick-Up

Delivery

Shipping

No Locations with Inventory Nearby.