UHEGDRR RV Toilet Seal & 3" Socket Floor Flange Kit for Dometic 300/310/320 — Flush Ball Seal & Base Gasket, Complete 3‑Piece Repa

UHEGDRR RV Toilet Seal and 3" Socket Floor Flange Kit is a complete three-part replacement pack designed to restore leak-free performance to Dometic 300, 310 and 320 RV toilets.

When an RV toilet starts to leak, smells, or feels loose, the issue is usually worn seals or a damaged flange. This all-in-one kit bundles a 3" socket floor flange (part 385345892) with two essential seals — the flush ball seal (385311658) and the base gasket (385311652) — plus fasteners and glands so you can replace the worn components without hunting for individual parts. Components are molded for corrosion resistance and designed to match factory dimensions for a snug fit with Dometic 300-series toilets.

How will this kit stop leaks and odors in my RV toilet?

Replacing both the flange and the sealing gaskets eliminates the common leak paths under and around the toilet base as well as through the flush valve area. The parts are engineered to re-establish water-tight and odor-proof connections.

• Includes a 3" socket floor flange that mounts securely to the floor opening.
• Flush ball seal (385311658) restores a tight flush valve closure to prevent water seepage.
• Base seal gasket (385311652) re-seals the toilet bowl to the flange to block odors.
• All necessary hardware (gland rings, nuts, bolts, screws, expansion anchors) for a single-service replacement.

Is this kit compatible with my Dometic 300, 310, or 320 toilet?

This repair set is made to match the shape and mounting dimensions used by Dometic 300-series toilets, so it’s suitable for direct replacement when those models show seal wear or flange damage. Always compare part numbers and physical measurements before installing.

• Specified fit for Dometic 300, 310 and 320 toilet models.
• Contains OEM-style parts: 385345892 flange, 385311658 flush ball seal, 385311652 base gasket.
• Provides both mechanical fasteners and expansion anchors for varied floor substrates.

How difficult is installation and what tools will I need?

Installation is straightforward for anyone comfortable with basic RV maintenance: remove the old toilet, clean the mounting surface, replace the flange and seals, then reattach the toilet using the supplied hardware. Expect light to moderate DIY time depending on floor type and rusted fasteners.

• Turn off water, drain and remove the toilet bowl before starting.
• Basic tools: screwdriver, wrench, utility knife, sealant (optional), and drill for anchors if needed.
• All necessary new nuts, bolts, screws, glands and seal rings included to simplify reassembly.

What materials and longevity can I expect from these replacement parts?

Parts are manufactured from durable polymers designed to resist wear and corrosion common in RV environments. While material life depends on use and maintenance, these components are meant to last longer than degraded original seals and provide a reliable repair until routine replacement is required.

• Corrosion-resistant polymer flange minimizes rusting and degradation at the floor connection.
• Elastomeric seals retain flexibility to maintain a tight seal over repeated use.
• Replacement hardware uses coated metals to resist oxidation in humid conditions.

Who is this for: The UHEGDRR RV Toilet Seal and 3" Socket Floor Flange Kit is intended for RV owners, technicians, and DIYers who own Dometic 300/310/320 toilets and need a single-package solution to repair leaks, eliminate odors, or replace worn mounting hardware. It’s ideal for routine maintenance or roadside fixes when you need compatible parts and the fasteners to complete the job.