RV Toilet Seal 3" Socket Floor Flange Kit for Dometic 300 310

RV Toilet Seal 3" Socket Floor Flange Kit for Dometic 300 310

Key Features

• Designed for Dometic 300, 310, and 320 RV toilets.
• Includes a 3-inch socket floor flange, base seal gasket, and flush ball seal.
• Rubber seals help create a secure connection around the toilet base to reduce water leakage and block unpleasant odors.
• The flange is made from ABS plastic, while the toilet seals are made from rubber for wear and corrosion resistance.
• The flange has a “THIS SIDE DOWN” marking to help identify the correct installation orientation.
• Package contents: 1 RV toilet flange, 1 base seal gasket, 1 flush ball seal, 2 bolt caps, 2 fixing bolts, 2 fixing nuts, 2 nut spacers, 4 screws, and 4 expansion screws.
• Lifetime protection covers product defects or issues.

Replaces / Cross-Reference Part Numbers

• 385345892 — 3-inch socket floor flange
• 385311658 — flush ball seal
• 385311652 — base seal

Compatibility & Fitment

When to Replace

• Replace the flange or seals when water leaks around the toilet base.
• A worn flush ball seal can allow odors to enter the RV or prevent the toilet from sealing properly.
• Cracked, deformed, hardened, or corroded components should be replaced during a toilet base repair.
• Replacing the seals and flange together can restore the connection when the existing components no longer provide a secure seal.

Installation Tips

• Remove the old flange and seals, then clean the toilet base and surrounding mounting area before installation.
• Position the new flange with the “THIS SIDE DOWN” marking oriented correctly.
• Install the base seal and flush ball seal in their matching locations, then secure the toilet with the included bolts, nuts, spacers, screws, and expansion screws as applicable.
• Confirm that the flange, seals, and drainpipe align before tightening the hardware.
• Check the toilet base for leaks and verify the seal after installation.