Genuine Thetford replacement seal kit for the automatic vent valve on the toilet waste holding tank. Designed to replace worn or leaking seals around the automatic vent, helping prevent waste or liquid leaking through the vent when the cassette is moved or tilted.

Suitable for Thetford C2, C3, C4, C200, SC200 and SC234 cassette toilet systems. Thetford's fitting instructions simply require removal of the automatic vent, replacement of the two seals and reassembly in reverse order.