Tecreddy RV Toilet Seal Replacement for Dometic 300/310/320/400/410/420 - 2-Pack Molded Rubber Flush Ball Gaskets

Tecreddy RV Toilet Seal Replacement is a two-piece rubber flush ball gasket kit engineered to fit Dometic models 300, 310, 320, 400, 410 and 420 (replaces part #385311658).

If your Dometic RV toilet is leaking or the flush ball seal is worn, this Tecreddy kit restores a reliable water-tight closure without the cost or hassle of a full toilet replacement. Made from a durable molded rubber compound using factory-style tooling, each seal matches the original shape and dimensions, so installation takes just minutes and requires no disassembly of the toilet assembly.

Will this gasket fit my Dometic toilet model?

Yes — the Tecreddy seal is specifically sized to replace part #385311658 and fits Dometic 300, 310, 320, 400, 410 and 420 units. It is not compatible with Dometic 210, 510 or models other than those listed.

• Outer diameter: 4.00 inches (matches original OEM profile)
• Inner diameter: 2.75 inches (seals flush ball reliably)
• Designed from original-device molds for accurate fit
• Sold as a convenient 2-pack for spare or dual-toilet use

How easy is it to install the Tecreddy toilet seal?

Installation is straightforward and fast — you typically pop the old seal out and press the new gasket into place with the marked side facing up. No special tools or toilet removal are required for most repairs, so the job can be completed in minutes.

• No toilet disassembly needed in normal cases
• Marked orientation ensures correct seating
• Hand-press installation—no adhesives or fasteners
• Instructions and two seals included for convenience

What materials and durability can I expect from this replacement seal?

The Tecreddy gasket is molded from a special rubber compound chosen for its resilience and long service life under RV conditions. The material resists deformation and keeps a stable seal through repeated flushing and variable temperatures commonly experienced in mobile bathrooms.

• Special rubber formulation for longevity
• Factory-style molds preserve OEM geometry
• Maintains watertight seal under normal use
• Two-piece pack reduces replacement frequency and downtime

What cost and maintenance advantages does this kit offer?

Replacing a worn flush ball seal is an affordable alternative to buying a new toilet or paying for expensive service labor. With two seals in the pack, you get value for future maintenance and the ability to fix leaks quickly to prevent water damage and odors.

• Low-cost repair avoids full toilet replacement
• Two seals included — one for immediate use, one spare
• Quick fix reduces potential water exposure to the floor
• Customer support available for fit or installation questions

Who is this for: The Tecreddy RV Toilet Seal Replacement 2-pack is ideal for RV owners, fleet managers, and DIYers who use Dometic 300/310/320/400/410/420 toilets and want a fast, accurate, cost-effective repair. If you need a durable, OEM-fit flush ball gasket to stop leaks and restore reliable flushing without removing the entire toilet, this kit gives you two high-quality seals and simple installation guidance to get back on the road quickly.