The Valterra E-Z Coupler Model F02-3103 Universal Sewer Adapter requires no clamps for usage, has a 2 piece design for easy storage, a 3/4" thread for draining a second gray water tank, and a cap designed to eliminate black water drip. The 90 degree elbow reduces stress on your sewer hose and the connector is designed to fit a 3" slip, as well as 3", 3.5" and 4" threaded sewer inlets.