boeemi RV Toilet Seal and 3" Floor Flange Kit for Dometic 300/310/320 — 3-piece replacement, leak-stop seals

boeemi's RV Toilet Seal and 3" Floor Flange Kit restores a dry, secure connection for Dometic 300/310/320 series toilets in minutes.

If your RV toilet base is leaking, this all-in-one replacement bundle gives you the three parts most commonly worn out: the 3" floor flange, a flush seal, and a base seal. Built specifically to match Dometic 300, 310 and 320 series toilets, the kit supplies the basic components needed to stop odors and water intrusion without a trip to a service center. It’s a compact, budget-friendly repair option designed for DIYers who want a reliable, no-frills replacement.

Will this kit fit my Dometic 300/310/320 toilet?

The boeemi kit was made for Dometic 300, 310 and 320 series toilet models, but fit depends on the exact base dimensions of your factory part. Compare your toilet base to the measurements of your old seals and the 3" flange opening. If your original hardware used a 3-inch flange and the base footprint matches, the kit should align correctly.

• Matches Dometic 300 / 310 / 320 series fittings.
• Includes a 3" floor flange sized for standard RV waste openings.
• Check base dimensions against your old seals before ordering.
• Not compatible with non-300 series or household toilets.

How hard is the installation for someone with basic tools?

Installation is straightforward for a handy RV owner. The kit replaces worn seals and the flange in a few simple steps: remove the old toilet, clean the mounting surface, place the new seals and flange, then resecure the toilet. Most people complete the swap in under an hour with common tools.

• Requires basic tools: wrench, screwdriver, utility knife, and cleaning supplies.
• Remove old seals and clean the toilet mounting area thoroughly.
• Set the new flush seal, then the base seal, and fasten the toilet to the flange.
• Test for leaks after reinstallation and tighten fasteners if needed.

What exactly is included and why each part matters?

This 3-in-1 kit bundles the common wear items so you don’t need to source them separately. The 3" floor flange secures the toilet to your RV waste outlet, the flush seal protects against leaks between the toilet and bowl, and the base seal seals the toilet rim to the floor. Replacing all three at once restores a complete interface, reducing the chance of odor or moisture issues.

• 3" floor flange — anchors the toilet to the RV waste pipe and centers the bowl.
• Flush seal — provides a watertight gasket between bowl and waste opening.
• Base seal — seals the toilet base to the floor to block leaks and smells.
• All parts are black for a tidy, low-profile appearance after installation.

How should I prepare the toilet area before fitting new seals?

Preparation is critical for a reliable seal. Clean away old gasket material, dust and grime so the new components sit flat and uninterrupted. Allow the floor to dry fully and inspect the waste opening for cracks or irregularities that could prevent a tight fit.

• Remove residue and old sealant with a scraper and solvent-safe cleaner.
• Dry the area completely to prevent trapped moisture under the new seals.
• Check the mounting surface for damage; repair if necessary before installing.
• Use the correct torque on fasteners—overtightening can deform seals.

Who is this for: RV owners and campers with Dometic 300, 310 or 320 series toilets who want a quick, economical DIY repair. If you’re maintaining a motorhome, travel trailer or camper and your toilet shows signs of leaking, odor, or loose mounting, this kit supplies the specific replacement parts you need. It’s not intended for other toilet series or residential plumbing systems—double-check your toilet model and base dimensions before purchasing.