A genuine Thetford OEM blue measuring cap designed to fit the C220 cassette toilet waste-holding tank. This cap doubles as both a tank closure lid and a measuring cup for accurately dosing Thetford toilet additives. It replaces lost or damaged caps, ensuring your tank stays sealed, leak-free, and properly dosed with chemicals for smooth operation.

Part Number: 20096785

Colour: Blue

Function: Waste tank cap and additive measuring cup

Material: High-strength ABS plastic

Kit Includes: 1 × Blue measuring cap for waste-holding tank

Compatability:

• Designed for Thetford C220 cassette toilets

• Fits directly onto the waste-holding tank outlet

• Colour-coded blue for the C220 range

 Not suitable for C200, C250, C260, or C400 toilets (these use different size caps)

Frequently Asked Questions

Q: What does this cap do?
It seals the waste-holding tank spout and also acts as a measuring cup for adding toilet additives such as Thetford Aqua Kem.

Q: How do I use it to measure additives?
Fill the cap to the recommended dose (shown on your additive bottle), pour it into the waste tank, then screw the cap back on tightly.

Q: Is this the waste tank cap or the flush water cap?
This is the waste tank measuring cap