A genuine OEM vent button for Thetford Porta Potti portable toilets (including the 335 series). Designed to allow air to enter the waste holding tank during emptying, reducing splashing, vacuum effects, and making the dump process smoother and cleaner.

For proper function, the vent button helps equalise pressure inside the waste tank when emptying. Without it, the waste may come out in spurts (glugging), may overflow or splash, or require more effort to remove.

OEM Part Number: T92407-111

Colour / Finish: White

Kit Includes:

• 1 × White vent button assembly

Compatability:

• Fits Thetford Porta Potti 335 (and also used across other Porta Potti models which share the same vent-button design)

• Thetford Porta Potti 145 / 165 and 335 / 345 / 365 portable toilets

Frequently Asked Questions

Q: What does this vent button do?
It releases built-up pressure inside the Porta Potti waste tank as waste is emptied. This avoids vacuum or glugging, leading to more consistent flow and reduced splashes.

Q: Does this vent button come with the spring and seal?
Yes, the button assembly includes the spring and internal seal. It is a complete replacement part

Q: Is this the same as the grey or coloured buttons I’ve seen on other Porta Potti models?
Yes, the function is the same. The colour may vary between model series, but part number T92407-111 is the current white OEM replacement.