Camco's RV Revolution 4-in-1 Sewer Elbow takes the hassle out of connecting to dump stations. It features a built-in gasket for an odor tight connection. The bayonet style elbow detaches from the 4-in-1 adapter to fit into an RV bumper. The elbow is translucent and swivels 360 degrees. The bayonet style adapter connects to lug fittings. There are no clamps or tools needed. The 4-in-1 adapter fits 3" NPT, 3-1/2" NPT, 4" NPT and 3" slip sewer inlets.