Keep your Waste Master sewer hose system working like new. This OEM-spec replacement donut seal restores the leak-proof connection between your Waste Master nozzle and RV campground sewer inlets -- an inexpensive fix that prevents messy, unsanitary blowouts at the dump point.
The donut seal is the soft gasket that sits at the tip of your Waste Master sewer hose nozzle and presses against the sewer inlet opening at campgrounds and dump stations. Over time, exposure to UV, heat, cleaning chemicals, and repeated use causes this seal to flatten, crack, or harden -- resulting in foul-smelling leaks right at the connection point. A fresh seal solves the problem immediately.
Lippert part number 340919 is the correct OEM replacement for the Waste Master sewer hose system. It is engineered to the same dimensions and durometer as the original, so installation is straightforward: remove the old worn seal from the nozzle groove and press the new one into place. No tools required.
Designed to fit approximately 90% of standard campground and dump station sewer inlets, covering the vast majority of RV park hookup scenarios.
Compresses against the sewer inlet rim to create a firm, odor-free seal during the dump cycle -- no clamps, no adapters needed.
Genuine Lippert part engineered specifically for the Waste Master nozzle profile. No trimming or modification required.
Weighs just 0.05 lbs. Small enough to stash a spare in your sewer kit compartment so you are never caught without one on a long trip.
Peel off the old seal from the nozzle tip groove, clean the groove surface, and press the new donut seal firmly into place. The seal should seat evenly all the way around the groove with no gaps. That is the entire installation process.
The Lippert Waste Master is a popular RV sewer management system known for its extendable hose and twist-lock nozzle design. This donut seal is a wear item specific to that system. If you are rebuilding or upgrading your sewer setup, look for the full Waste Master Sewer Kit or replacement nozzle assembly separately.