NDS 930 9" Black Square Low-Profile Adapter Drain, Connects to 3" to 8" Drain Pipes covers more surface area for stormwater capture than just the pipe diameter alone. Use with 9x9 catch basin drain grate to drain heavy flows from lawns, landscaped areas, under downspouts, patios, and walkways. The 9 in. Square Low-Profile Adapter connects to 3 in. to 8 in. drain pipes using the appropriate outlet adapter. Connect to 3 in. & 4 in. drain pipes with outlet adapters (1242, 1243, 1245); 6 in. drain pipes with outlet adapter (1266); 8 in. drain pipes with outlet adapter (1889). The low-profile adapter is made of high-impact polystyrene (HIPS) treated with UV inhibitors. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.