385311652 & 385311658 RV Toilet Seal Kit for Dometic 300 Series

385311652 & 385311658 RV Toilet Seal Kit for Dometic 300 Series

Key Features

• Includes 1 floor flange seal and 1 flush ball seal.
• Includes 2 fixing bolts, 2 fixing nuts, 2 nut spacers, and 2 bolt caps.
• Replaces the base seal and flush ball seal to help restore a tight toilet seal.
• Flexible, wear-resistant rubber construction resists drying, cracking, and deformation through repeated compression, summer heat, and winter travel.
• The included bolts, nuts, spacers, and caps provide a secure hold for the toilet base.

Replaces / Cross-Reference Part Numbers

• 385311652 — base seal and floor flange seal
• 385311658 — flush ball seal

Compatibility & Fitment

• Fits Dometic 300, 310, and 320 Series RV toilets.
• Does not fit Dometic 210 or 510 models, or models outside the listed series.
• Compare the existing seals, size, and part numbers before ordering. Seals from other series may look similar but are not interchangeable.

When to Replace

• Water pools around the toilet base.
• Bowl water drains away between uses.
• Odors remain inside the RV after flushing.
• The foot pedal feels soft.
• A worn base seal or flush ball seal no longer maintains a tight joint, allowing bowl water or odors to escape.

Installation Tips

1. Shut off the water supply, press the foot pedal, and remove the old gasket.
2. Clean debris from the toilet rim and flush ball surface.
3. Apply silicone grease to the bottom and groove of the new seal.
4. Press the seal into place with the “THIS SIDE UP” marking facing upward.
5. Turn the water back on and check the toilet base and seal area for drips.