Thetford Cassette Toilet Automatic Vent

This is the genuine Thetford automatic vent fitted to the waste holding tank of C-series cassette toilets, allowing air to vent from the tank as it fills so it empties smoothly without glugging or splashing back. It's a direct replacement for a cracked, stuck or leaking vent valve on tanks built after June 1993.

• Genuine Thetford spare part
• Manufacturer part number: 2372274 (also listed as 23722-74)
• Fits Thetford C2, C3, C4, C200 and C220 series cassette toilet holding tanks (post June 1993)
• Shipping weight: approx. 60g

• Why is my cassette tank glugging or splashing back when I flush? This usually points to a blocked, cracked or stuck automatic vent, replacing it restores normal air venting as the tank fills.
• Which cassette toilets does this fit? It fits C2, C3, C4, C200 and C220 series holding tanks manufactured after June 1993, older tanks may use a different vent design.
• Is this a DIY fit? Yes, the vent is a simple push-fit/clip component that can be replaced without special tools.
• Does it come with fitting instructions? Thetford publishes a repair instruction sheet for this part, and it's a straightforward like-for-like swap.