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 Valve Adapter, model # F02-3101. 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. The interior seal provides a tight, leak-proof connection.