Dometic RV Toilet Base Seal and Mounting Hardware Kit for 300/400 Series — White caps, OEM replacement

Genuine Dometic base seal and mounting hardware kit for 300 and 400 Series (Sealand compatible) toilets, providing factory-fit replacement parts to secure and seal the toilet base.

If you need to reinstall, service, or replace the base hardware on a Dometic 300 or 400 Series toilet, this OEM kit contains the exact components designed to restore a proper fit and reliable seal. Manufactured to the same specifications as the original parts, the kit reduces the chance of movement, corrosion, or leaks that can occur with worn or non‑OEM replacements.

How does this kit restore toilet stability?

The kit replaces the rubber flange seal and mounting fasteners that anchor the toilet to the RV floor, preventing shifts caused by vehicle motion and vibration. Replacing aged or damaged parts with factory-fit components ensures the seat and bowl stay firmly positioned under normal travel conditions.

• Includes rubber flange seal engineered for a snug base-to-floor interface
• OEM bolts and hardware resist loosening from vibration
• White caps provide a finished look while protecting fasteners

Will this kit prevent leaks at the toilet base?

The rubber flange seal in the kit restores the barrier between the toilet outlet and the waste fitting, helping to reduce seepage at the base when installed correctly. While proper installation is essential, using original equipment parts helps recreate the factory sealing surface and alignment.

• Precisely sized flange seal matches Dometic 300/400 Series openings
• Hardware secures even compression of the seal for consistent contact
• Corrosion-resistant components maintain clamp force over time

Is this kit compatible with my RV toilet model?

This Genuine Dometic kit is designed specifically for Dometic 300 and 400 Series toilets and Sealand models that share the same mounting system. If you own one of these series, the parts are factory-specified to match the original installation dimensions and finish.

• Fits Dometic 300 Series toilets
• Fits Dometic 400 Series toilets
• Compatible with Sealand toilets using the same flange and bolt pattern

What comes in the kit and what tools are needed for installation?

The package includes the rubber flange seal, mounting bolts and fasteners, and white hardware caps for a clean finish. Basic hand tools like a screwdriver, wrench, and possibly a utility knife to remove the old seal are usually sufficient; the job can be completed in a short maintenance window by a DIYer or technician.

• Rubber flange seal sized for 300/400 Series toilets
• Stainless or corrosion-resistant mounting bolts and nuts
• White plastic caps to cover fastener heads for aesthetics and protection

Who is this for? RV owners, fleet maintenance teams, and service technicians who require a reliable, factory-correct replacement for worn toilet base components will benefit from this Dometic OEM kit. Choose this set when you want parts that match original specifications, maintain warranty integrity, and restore proper fit, seal, and stability to Dometic 300 and 400 Series or compatible Sealand toilets.