Make installation of catch basin to 8 in. drain pipe quick, easy, and worry-free. The Outlet Adapter connects 18 in. and 24 in. catch basin drains and 18 in. low-profile adapter drain to 8 in. sewer and drain pipe and 8 in. single-wall corrugated pipe. Connection to 24 in. catch basin requires additional Outlet Adapter with Reducer Ring (2410). Made of high-impact polystyrene (HIPS) treated with UV inhibitors.