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 Hose Coupler, model # F02-3102. This is a self-threading system offering a secure connection. It does not require clamps to secure the fitting to the hoses, and it will work with both right-handed and left-handed coil hoses measuring three inches in diameter. This unit couples two hoses together and provides a tight, leak-proof connection.