NDS Catch Basin 12 in. x 12 in. 4 in. Opening Black. Give excess stormwater an express route downstream before it leads to a flooded, mucky mess and costly damage on your property. The 12 in. Square Catch Basin drain is just what you need to capture water from flood-prone areas such as lawns, landscaped areas, under downspouts, patios, and walkways, and direct it to your pipeline. The 12 in. stormwater catch basin drain has 4 openings which connect to 3 in., 4 in., 6 in., and 8 in. drain pipes with applicable outlet adapter; opening(s) can be sealed with an outlet plug (outlet adapters and plug sold separately). Basin is made of polypropylene (PP) treated with UV inhibitors. Built-in sump area is easy to access and clean.