TOMOON RV Toilet Valve Kit for Dometic 300/310/320 — Leak-Proof, Anti-Freeze, All-in-One

Overview: A direct, ready-to-install replacement

The TOMOON RV Toilet Valve Kit is designed as a direct replacement for OEM parts 385311641 (water valve) and 385311658 (flush ball seal). It fits Dometic 300, 310, 320 and 301, 311, 321 models, as well as Sealand, Traveler, and Vacu-Flush pedestal toilets used in RVs, campers, and marine vessels. Note: it is not compatible with 506, 706, 709, 806, or 808 models. This kit helps you renew the core components quickly, avoiding extended downtime on the road or at sea.

Leak-proof design for reliable everyday use

Engineered with precision-molded rubber seals, tight threaded connections, and stainless steel clamps, the assembly aims to minimize piston leaks. The result is reduced water waste, less risk of floor moisture, and fewer odor concerns between toilets maintenance cycles.

Anti-freeze durability for year-round confidence

Constructed from reinforced polymer and featuring ultrasonic welding, the valve assembly withstands cold conditions (tested to -20°F / -29°C) without cracking. This design helps resist mineral buildup and daily wear during winter camping or brackish-water trips.

All-in-one kit for fast repairs

Everything you need comes in one package: 1 water valve, 1 flush seal, 1 hose clamp, 2 mesh filters, and 2 mounting screws. No extra parts to source means fewer shopping trips and faster repairs.

Quick, tool-free installation

Most users can complete the replacement in about five minutes with no specialized tools. Clear online guides support a smooth, self-directed upgrade for fresh, efficient flush performance.

Warranty and trusted support

TOMOON backs this kit with a 2-year warranty. If any component fails during normal use, we offer a replacement or full refund and assist with compatibility checks or installation help as needed.

Key benefits in real-world use

• Restore strong flush performance on RV, camper, and marine toilets.
• Help prevent leaks that could damage floors or create odors.
• Enjoy winter-ready components that resist cracking and mineral buildup.
• One-box convenience minimizes downtime and simplifies repairs.

• Includes all required parts for a complete replacement.
• Clear guidance and responsive support to ensure a smooth experience.