The C400 waste cassette can be serviced independently of the installed toilet body. Thetford's detailed exploded tank drawing shows the sliding cover, blade and seals, pour-out elbow, vent mechanism, pull handle and wheels. Use it to distinguish parts of the cassette from the C402C or C403L flush-water equipment.
Matching C400 cassette repair parts and complete tanks
The lip seal, pour-out spout and blade-opening mechanism are separate service parts. The complete 19 L waste tanks are sold in left-hand and right-hand versions. Compare the original part number and tank orientation before choosing a replacement.
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
Additional numbered parts
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 | 32301 | Sliding waste-cassette cover | |
| Assembly (refs. 2–21) | 32331 (right; 3233106) | Complete right-hand blade mechanism | |
| Assembly (refs. 2–21) | 32332 (left; 3233206) | Complete left-hand blade mechanism | View matching part |
| 2 | 32300 | Blade opener (32300 component group, refs. 2–5) | |
| 3 | 32300 | Washer (included in matching mechanism service assembly) | |
| 4 | 32300 | Mechanism seal | |
| 5 | 32300 | Mechanism retainer | |
| 6 | 32302 | Left-hand tank plate | |
| 6 | 32328 | Right-hand tank plate | |
| 7 | 50724 | Mechanism seal | |
| 8 | 23721 | Waste-opening lip seal | View matching part |
| 9 | — | Seal plate | |
| 10 | — | Screw (within complete mechanism assembly) | |
| 11 | — | Mechanism retainer | |
| 12 | 32304 | Float mechanism magnet | |
| 13 | 32304 | Float arm assembly | |
| 14 | 50731 | Waste slide blade | |
| 15 | — | Blade bearing | |
| 16 | — | Blade operating arm | |
| 17 | — | Bushing | |
| 18 | — | Screw | |
| 19 | — | Blade driver | |
| 20 | — | Support track | |
| 21 | — | Support screw | |
| 22 | — | Vent lid | |
| 23 | — | Vent lifter | |
| 24 | — | Vent spring | |
| 25 | 32305 | Vent-pivot and float service assembly | |
| 26 | 32305 | Vent seal included in assembly | |
| 27 | 32305 | Float stem included in assembly | |
| 28 | 32305 | Float included in assembly | |
| 29 | — | Vent actuator | |
| 30 | 32306 | Pour-out spout assembly (refs. 30–32) | View matching part |
| 31 | 25810 | Measuring cup; older original number | |
| 32 | — | Spout O-ring | |
| 33 | — | Transport-handle cover | |
| 34 | — | Handle screw | |
| 35 | — | Pull handle | |
| 36 | — | Vent clip | |
| 37 | — | Vent button | |
| 38 | 32307 | Vent spring and seal assembly | |
| 39 | 32307 | Vent seal included in assembly | |
| 40 | — | Waste tank upper body | |
| 41 | — | O-ring | |
| 42 | — | Wheel support bracket | |
| 43 | 51805 | Pull-handle service assembly | |
| 44 | 51805 | Handle bushing, supplied as assembly | |
| 45 | 51805 | Pull-handle spring, supplied as assembly | |
| 46 | 51801 | Tank lock clip | |
| 47 | — | Transport wheel | |
| 48 | 32308 | Wheel bearing, right | |
| 49 | 32308 | Wheel bearing, left | |
| 50 | — | Waste tank lower body | |
| Complete L | 3232606 | Newer complete left-hand waste tank | View matching part |
| Complete R | 3232706 | Newer complete right-hand waste tank | View matching part |
Thetford's original list uses grouped assembly numbers: 32300 covers refs. 2–5; the 32331 right-hand and 32332 left-hand mechanisms cover refs. 2–21; and 32306 covers spout components at refs. 30–32. Choose the mechanism by the tank's left/right configuration.
Check the right model and part
There are left- and right-hand C400 cassette versions. Thetford's earlier waste-tank drawing lists 32326 and 32327; its November 2025 C402C/C403L list gives the updated complete tank numbers 3232606 (left) and 3232706 (right). The two are not interchangeable by orientation alone.