A genuine Thetford OEM lip seal designed for Porta Potti 335, 345, and 365 portable toilets. This vital rubber seal sits between the top and bottom tanks, ensuring a watertight, odour-free connection and allowing the waste blade to open and close smoothly.

1 × Lip seal (Porta Potti 335/345/365 compatible)

Part Number: T07101

Material: Chemical-resistant rubber

Function: Waste-blade sealing ring

Outer Diameter: Approx. 120 mm

Compatability:

• Designed for Thetford Porta Potti 335, 345, and 365 models

• Fits both manual and piston-flush versions

Frequently Asked Questions 

Q: What does this seal do?
It sits between the top flush-water tank and the bottom waste-holding tank, sealing them together and preventing leaks and odours while allowing the waste-blade valve to move smoothly.

Q: How do I install the new seal?

1. Separate the top and bottom tanks.

2. Remove the old seal from the groove.

3. Clean the groove with mild soapy water — no harsh chemicals.

4. Press the new seal evenly into place.

5. Apply a small amount of Thetford Seal Lubricant for smooth operation.

Q: Can I use silicone spray or Vaseline to lubricate it?
No , petroleum or silicone products can damage the rubber. Only use Thetford Seal Lubricant, which is safe and prolongs seal life.