RhinoFLEX Elbow & 4 In 1 Adapter with Swivel Bayonet FittingCamco&';s RhinoFLEX Elbow and 4-in-1 Adapter with Swivel Bayonet Fitting make it easier to connect to dump stations. It fits securely into four sizes of dump station inlets: 4-inch NPT, 3. 5-inch NPT, 3-inch NPT, and 3-inch slip fitting. The elbow is clear, so you can see when your sewer hose is completely draining. It has a built-in gasket for an odor-tight connection. The swivel bayonet fitting makes the elbow compatible with any lug fitting and allows it to rotate 360 degrees, making it easy to connect. For storage, the elbow detaches from the 4-in-1 adapter and fits into a 4-inch square RV bumper.Features: Securely Connects: The RV sewer elbow adapter fits securely into the dump station connection Fits Four sizes of Dump Station Inlets: fits securely into four sizes of dump station inlets- 4-inch NPT, 3. 5-inch NPT, 3-inch NPT, and 3-inch slip fitting The elbow is clear so you can see when your sewer hose has finished draining The fitting rotates 360 degrees; the built-in gasket provides an odor-tight connection The elbow detaches from the 4-in-1 adapter and fits into a 4" square RV bumper