The C200 removable waste cassette has its own service parts, separate from the toilet's freshwater flush system. Thetford's exploded view for the wheeled tank identifies the blade mechanism, vent pieces, pour-out cap, tank lip seal, float arm and pull handle by numbered callout.
Original manufacturer exploded-view drawings
Find the numbered reference on the factory drawing, then use the table below to identify the original manufacturer part number. Open the full PDF to enlarge small components.
Manufacturer exploded illustration
Numbered parts table
Identify the lip seal and pour-out cap
The lip seal sits around the waste-tank blade opening; the yellow cap closes the pour-out spout and serves as a measuring cup. They are separate service parts. Thetford's reference includes 23721 for later C200 tanks and 25810 / 2581078 for the yellow cap.
Component numbers and descriptions
These are original parts references for the model or tank shown. Entries without a product link are included for identification; where NewRVParts has an exact-number match, you can review its listing.
| Callout | Original no. | Component | Product |
|---|---|---|---|
| 1 | — | Waste-holding tank body | |
| 2 | 23847 | Sliding waste-blade component | |
| 3 | — | Waste blade operating arm | |
| 4 | 23743 | Blade opener | |
| 5 | — | Vent foam | |
| 6 | 21528 | Automatic-vent seal | |
| 7A | 23722 | Upper automatic vent | |
| 7B | 23788 | Upper vent for outside-vent configuration | |
| 8 | 16195 | Spout O-ring or seal service reference | |
| 9 | — | Spout cap seal | |
| 10A | 16384 | Waste spout dump cap | |
| 10B | 25810 | Older yellow measuring cup; current reference 2581078 | |
| 11 | — | Pour-out spout | |
| 12 | 21333 | Sliding tank cover | |
| 13 | — | Screw cover | |
| 14 | — | Cover screw | |
| 15 | — | Cover seal | |
| 16 | 23721 | Waste tank lip seal | View matching part |
| 17 | — | Air release button | |
| 18 | 07524 | Vent spring | |
| 19 | — | Seal retainer | |
| 20 | 23726 | Tank float arm | |
| 21 | 23849 | Waste-tank lock clip | |
| 22 | 200640 | Two transport wheels | |
| 23 | — | Wheel axle | |
| 24 | 200641 | Transport handle grip | |
| 25 | 200642 | Transport handle | |
| 26 | 200644 | Transport-handle bracket | |
| Related replacement | 2581078 | Newer yellow measuring cup service number | View matching part |
Check the right model and part
This exploded view illustrates the wheeled C200 cassette-tank arrangement. Compare your tank's label, wheeled or non-wheeled construction, blade opening, and vent layout before selecting a replacement. The seal 23721 and cap 25810 / 2581078 are not interchangeable: one seals the blade opening and the other closes the pour-out spout. Older tank versions can have different service parts.