THETFORD CASSETTE TOILET C2 C3 C4 DRAIN CAP WATERFILL IN CLEAR PLASTIC 1638578
PART NUMBER 1638578. CARAVAN THETFORD CASSETTE C2 C3 C4 WATERFILL DRAIN DOWN CAP. FOR USE WITH THETFORD CASSETTE TOILET C2 C3 C4. LOCATED BELOW WHERE YOU FILL THE SYSTEM WITH FRESH WATER.