Gentle used catch basin. We thought it was new until opened up and saw some water marks. Missing 1 NDS 1206 outlet plug and 1 NDS 1244 outlet adapter. Collect stormwater runoff and standing water on your property and direct to drain pipes before it causes costly property damage. Manage heavy flows of water from lawns, landscaped areas, under downspouts, patios, and walkways Connect to 4 in. Sewer Drain, Single-Wall Corrugated Triple-Wall Pipes 4 in. Sch. 40 Pipe using included outlet adapters; additional outlet adapters sold separately for connections to 6 in. 8 in. Pipes. 162 GPM flow rate for 12 in. square plastic grate . 12 in. square grate has an open surface area of 53.1 sq. in. Rated for NDS Class B loads (up to 175 psi) when properly installed with grate? for medium-duty pneumatic tire traffic, autos, light trucks at speeds less than 20 mph Lightweight and easy to install. Four weep hole knockouts on bottom to eliminate stagnant water Keyed side openings lock outlet adapters in place; knockout on bottom for additional keyed opening if needed. Outlet adapters provide a secure, soil-tight fit to pipe?no tape or glue required; included plug fits inside outlet adapter and seals catch basin opening to direct flow of water