Dometic Sealand RV Toilet Repair
Dometic Sealand pedestal-flush toilets (such as the 510, 210, and Traveler series) feature porcelain bowls and mechanical foot-pedal flush mechanisms. The two most common maintenance issues on these units are water leaking out of the bowl into the holding tank (caused by a worn flush ball seal) and water leaking onto the floor during a flush (caused by a cracked water valve assembly).
Replacing the Bowl Ball Seal
If water will not stay in the toilet bowl, sewer odors can enter the bathroom, and waste will dry out inside the black tank. Replacing the seal takes roughly 15 minutes:
- Turn off the water supply pump and step on the flush pedal to drain remaining bowl water.
- Loosen the stainless steel band clamp that joins the upper porcelain bowl to the plastic base pedestal.
- Lift the porcelain bowl straight up off the pedestal to expose the flush ball and two-piece rubber seal.
- Remove the old seal ring and thoroughly clean all scale buildup off the Teflon flush ball surface.
- Install a new Dometic toilet ball seal kit with the raised alignment rim facing upward toward the bowl.
- Reposition the bowl, re-tighten the band clamp, and condition the new seal using RV toilet seal lubricant or plumber's silicone grease.
Replacing the Water Valve Assembly
If water drips onto the floor behind the pedal when flushing, the water module plastic casing has likely cracked from winter freeze pressure:
- Shut off the water supply and disconnect the water line from the back of the pedal assembly.
- Remove the mounting screws holding the water module to the flush pedal housing.
- Snap in a new replacement Dometic toilet water valve and re-secure the mounting screws.
- Re-attach the supply line, turn on the water pressure, and check for leaks.
See also:
- RV Waste Valves – Servicing 3-inch black tank gate valves and cable pulls.
- RV Holding Tanks – Managing holding tank chemical treatments and enzyme digesters.