NDS Riser 12 in. x 12 in. Black w/ 2 Openings

Capture surface water with a catch basin placed deeper in the ground while outletting and/or inletting at a higher elevation with the 12 in. Riser with 2 Openings. The riser nests on top of a 12 in. square catch basin or 12 in. low-profile adapter and adds 9-7/8 in. of height. The 12 in. Riser features two openings which connect to 3 in. to 8 in. drain pipes using appropriate outlet adapters, and can be sealed off with an outlet plug (outlet adapters and plug sold separately). The extension riser also fits on top of the 12 in. sump box to increase sump volume. The riser is made of high-impact polystyrene (HIPS) treated with UV inhibitors.