TOMOON RV Toilet Seal 2-Pack for Dometic 300/310/320

Overview

Meet the TOMOON RV Toilet Seal 2-Pack, a premium gasket kit designed to replace the Dometic 300/310/320 seals with precision. This direct-swap solution mirrors the OEM Part #385311658, offering a seamless replacement without modifications. Expect a dependable seal, quiet flush cycles, and a cleaner RV bathroom during your journeys.

The rubber feels slightly tacky to the touch, flexible and resilient, with a subtle grip that helps the seal stay seated under pressure. When the toilet lid is closed, the gasket helps minimize splash and wicks away minor moisture for a more comfortable space on the move.

Replacing a worn seal is a simple maintenance moment that can reduce the time you spend troubleshooting leaks and odors, helping you focus on the road ahead rather than your plumbing fixtures.

Compatibility & Fit

• Exact match for Dometic 300/310/320 models—direct replacement for Part #385311658.
• NOT compatible with Dom-etic 210/510 or unlisted models—verify your unit before ordering.
• Includes two seals, so you can keep a spare on hand for peace of mind on long trips.

Premium Rubber & Durability

• High-grade, wear-resistant rubber blends deliver lasting flexibility and a tight seal under varying conditions.
• Engineered to resist hardening and cracking, maintaining a reliable fit even after repeated cycles.
• Designed to tolerate routine lubrication and cleaning without losing performance.

All-Condition Durability

• Built to handle cold weather, rough roads, and long trips without losing seal integrity.
• Reinforced design helps prevent leaks and backflow on bumpy terrain; performance remains consistent.
• Maintains seal performance across a range of temperatures for RV, travel trailer, and camping use.

Value & Convenience

• 2-Pack provides a spare for emergencies or seasonal maintenance—no urgent store runs.
• 5-minute, no-tools installation enables quick on-the-road repairs and routine upkeep.
• Avoids replacing the entire unit when a single gasket can restore function.

Installation Tips

Shut off water, remove the old seal, clean the surface, and press the new gasket into place. Apply a light silicone lubricant for smoother seating if desired. For best results, re-check the fit after the first flush.