Identifying Your Thetford Cassette Toilet Model

1. Quick Answer

The easiest way to identify a Thetford cassette toilet is to remove the waste cassette and look for the data sticker on the toilet base or inside the cassette access area. The model is usually shown near the barcode, such as C2, C3, C4, C200, C220, C250/C260 or C400.

If the sticker has been removed or is unreadable, use the shape of the waste cassette, the cassette access door, and the seat/bowl style to narrow the model down before ordering parts. Do not rely only on the caravan make or year, as manufacturers often fitted different toilet models in the same period.

2. Find The Data Sticker

Start by opening the outside toilet service door and sliding the waste cassette out. The data sticker is normally attached to the base of the toilet, under or behind the waste holding tank area. On many Thetford cassette toilets the model number is printed near the beginning of the sticker, above or close to the barcode.

The sticker may also include a date or production code. This can matter for older C2/C3/C4 toilets because some parts changed through the production run. If you are choosing between early and late versions of a seal, blade or cassette part, keep the date code handy.

3. Identify By The Waste Cassette

If the sticker is damaged, the waste cassette is the next best clue. The handle position, wheels, vent button, pour-out spout and cassette body shape usually separate the main Thetford ranges.

The C200 and C2/C3/C4 series originally used cassettes without wheels. Thetford later redesigned these cassettes to include wheels and a pull handle. The overall cassette dimensions stayed the same, so the newer wheeled versions are a direct replacement for the older wheel-less versions.

For C400 toilets, also check whether the cassette is left-hand or right-hand access. This is judged from the position of the cassette service door when you are sitting on the toilet. Ordering the wrong side can mean the cassette will not fit your installation.

4. If The Sticker Is Missing

If there is no readable sticker, do not guess from the toilet colour alone. White, cream and grey plastics were used across more than one model family.

• Remove the cassette and photograph the cassette, toilet opening and service-door area.
• Look for moulded part numbers on the cassette, seat, blade handle or pump parts.
• Compare the cassette shape with the image above before choosing spare parts.
• Check whether the flush is manual, 12V electric, or connected to the caravan water pump.
• For older toilets, keep any date code or serial number because some seals and mechanisms changed over time.

If your toilet flush has stopped working, identifying the model is still the first step. Common causes include a blown fuse, stuck pump, failed flush switch, blocked nozzle, reed switch fault, or wiring fault, but the correct part depends on the toilet model.

5. Find The Right Spare Parts

Once you know the Thetford model, use the matching spare parts category below. This is safer than searching by the caravan brand because the same van model can be fitted with different toilet versions.

6. Choose The Correct Waste Cassette

If you need to replace the waste cassette, choose by toilet model and cassette side/access style. Some cassettes look similar at a glance but are not interchangeable.

7. Before Ordering Parts

Before ordering, check the model, cassette style, and any date or production code. For flush faults, identify whether your toilet has a manual pump, its own electric pump, or a valve connected to the caravan's pressure water system. For blade or lip seal faults, compare early and late versions where the product notes mention a production date.

If you are replacing the cassette because it leaks, inspect the cap seal, lip seal, vent seal and blade area as well. Sometimes the cassette is still usable and only the seal or vent part needs replacing.