The Valterra EZ Coupler system provides easy-to-use products working in unison to help make your sewer interaction as fast and as painless as possible. This is the EZ Coupler Bayonet Adapter, model # F02-3108. This is a self-threading system offering a secure connection. It does not require clamps to secure the fitting to the hose, and it will work with both right-handed and left-handed coil hoses measuring three inches in diameter.