Thetford Toilet Cassette Identification Guide

If you have ever stood in a caravan parts aisle, or opened an online spare parts catalogue, staring at a wall of nearly identical white plastic components, you are in good company. Thetford is the most common brand for cassette toilets in Australian caravans, which means there are decades' worth of models sitting in vans across the country. Knowing exactly which one you own determines whether the seal you order actually fits, whether the replacement cassette slides cleanly into place, and whether your electric flush returns to life after a service. This guide walks you through every method available for identifying your Thetford toilet cassette model, quickly, accurately, and without guesswork.

Key Takeaways

• The data badge is your fastest route: 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. Do this before anything else.

• Never rely on your caravan's make or year: Do not rely only on the caravan make or year, as manufacturers often fitted different toilet models in the same period. The same van model can contain different toilet versions, so go directly to the toilet itself.

• Left-hand or right-hand access matters for bench models: To determine whether you currently have a right hand model or left hand model cassette toilet, the waste tank access will either be located on the right side or left side while you are sitting on the toilet. Ordering the wrong side means the cassette will not fit.

• Date codes matter on older units: 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.

• Cassette shape is your fallback identifier: 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.

Quick-Start Prioritisation Framework

Start here if you are:

• A first-time caravan owner: Go straight to the data badge. Remove the cassette, photograph the sticker, and cross-reference the model number against the series guide below.

• Ordering replacement seals or blades: Find both the model number AND the date or production code before adding anything to your cart.

• Replacing a full cassette on a bench-style toilet (C400/C500): Confirm the model, then determine left-hand or right-hand access before purchasing.

How to Find Your Thetford Model Number

Step One: Check the Data Badge First

Do not rely only on the caravan 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. Do not rely only on the caravan the model number is printed near the beginning of the sticker, above or close to the barcode.

The model is usually shown near the barcode, such as C2, C3, C4, C200, C220, C250/C260 or C400. Once you have that designation, you can match it to the correct spare parts range. For the C200 series, Thetford's official C200 support page confirms that there is a data badge located underneath the waste-holding tank and on the bottom of the waste-holding tank.

Pro Tip: If the sticker is in a dark, hard-to-read location, use the torch on your mobile and take a photograph rather than trying to read it on the spot. Zoom in on the image afterwards, where the model number and date code will usually become legible.

Step Two: Use the Serial Number as Your Backup

If the data badge is faded but partially legible, the serial number is still worth recording. According to Thetford's official serial number FAQ, the serial number label can usually be found near the location where you remove the tank. There is also a serial number on both the cassette and the tank.

For toilets with no readable badge at all, Thetford's identification FAQ recommends sending photographs of the unit alongside information about the flush type, whether the unit is a hand flush foot flush, or wall panel flush, which immediately narrows down the possible models.

Step Three: Examine Physical Features

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 do not guess from the toilet colour alone. White, cream and grey plastics were used across more than one model family.

Do not rely only on the caravan the cassette, toilet opening and service-door area. Look for moulded part numbers on the cassette, seat, blade handle or pump parts. These moulded references often survive years of cleaning and wear far better than adhesive stickers.

The Complete Thetford Cassette Series Guide

C2, C3 and C4 Series (Legacy)

The C2/C3/C4 series had its first market introduction in 1987 and last production in 2006. These are the legacy bench and pedestal-style toilets most commonly found in older Australian caravans. If your van was built before the mid-2000s, there is a strong chance this is what you have.

Do not rely only on the caravan 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. This is important: if your cassette lacks wheels, that does not automatically mean your cassette is no longer available, a wheeled replacement will still fit.

C200 Series

The C200 is the direct successor to the C2/C3/C4 line and represents the most widespread pedestal-style cassette toilet in Australian caravans. According to Thetford's C200 support page, a Thetford cassette toilet is a lightweight and compact toilet designed for use in caravans and motorhomes. The waste is stored in a removable cassette tank, which can be easily emptied into a designated waste disposal point.

The C200 is a discontinued model, so identifying the production code on the data badge is particularly important. Genuine Thetford spare parts can be sourced for the C200 from as far back as 2010. If you own a C200 and need parts, always quote the production date alongside the model number when contacting a supplier.

C220, C250 and C260 Series

These three series represent the mid-range swivel-bowl generation of Thetford cassette toilets. The bowl design is one of the key visual identifiers. According to Thetford's C220 support documentation, Thetford C220 cassette toilets boast excellent seating comfort, and feature a waste tank equipped with a handle and wheels for effortless transportation. C220 toilets are set up with or without flush water tank and console, and with manual or electric flush.

The C250 and C260 are closely related and share some spare parts. The C260 is the premium variant. As noted on Thetford's cassette toilet product range, the C260 cassette toilets are created for optimal comfort. The series is available in premium-quality plastic or with a ceramic bowl for home comfort. The waste tank presents three level indicators and is fitted with handle and wheels. If you are unsure whether you have a C250 or C260, check whether your bowl is ceramic or plastic, the ceramic bowl version is always the C260.

Pro Tip: The C250 and C260 share certain parts, including the bowl retainer bracket and handle, but they do not share all components. Always confirm the exact sub-model before ordering seals or blade mechanisms.

C400 Series

The Thetford C400 cassette toilet gives the bathroom of your caravan or camper a contemporary look and a high level of comfort and functionality. C400 toilets are made of durable and high-quality materials and boast a powerful flush system. The waste tank is fitted with three level-indicators and a handle and wheels for effortless transport and disposing.

The C400 is a bench-style toilet, meaning it installs against a wall rather than sitting freestanding as a pedestal. This design introduces the critical left-hand/right-hand access distinction. Do not rely only on the caravan 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. The C402C model is one of the most widely fitted variants in Australian caravans, according to My Generator's caravan toilet guide: the Thetford C402-C is one of the most popular cassette toilets on the market. The waste-holding tank has a huge capacity of 19.3L, which means you don't need to empty it as often.

Flush Type as an Identification Tool

When the data badge is unreadable and the cassette shape is ambiguous, the flush mechanism is an excellent supplementary identifier. Do not rely only on the caravan 12V electric, or connected to the caravan water pump. This single detail eliminates multiple model families at once.

Manual flush mechanisms are predominantly found on older C2/C3/C4 and early C200 units. Electric flush systems identify the unit as a later C200 variant, a C220, C400, or C500. A valve connected to the caravan's onboard water system is a clear indicator of a C400 or C500 bench installation. Whilst some cassette toilets have their own water tank for flushing, most are connected to the onboard water supply.

Pro Tip: If your flush has stopped working entirely, resist the urge to start replacing parts before you have confirmed the model. Do not rely only on the caravan 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.

Common Identification Mistakes to Avoid

Assuming All White Cassettes Are Interchangeable

This is perhaps the most expensive mistake a caravan owner can make. Do not rely only on the caravan cassette, choose by toilet model and cassette side/access style. Some cassettes look similar at a glance but are not interchangeable. A cassette from a C220 will not seat correctly in a C400 housing, and a right-hand C400 cassette will not slide into a left-hand installation regardless of how similar the tanks appear.

Searching by Caravan Brand Instead of Toilet Model

Do not rely only on the caravan use the matching spare parts category. This is safer than searching by the caravan brand because the same van model can be fitted with different toilet versions. Two caravans of identical make and year sitting side by side in a showroom may have been fitted with different Thetford series, always trace the model number back to the toilet itself.

Ignoring the Production Date on Legacy Units

Do not rely only on the caravan code or serial number because some seals and mechanisms changed over time. The C2/C3/C4 production run spanned nearly 20 years, and component specifications changed. A lip seal designed for a pre-1994 C4 is not necessarily compatible with a late-production C4 from 2004.

At Trailer Camper Australia (TCA), questions about Thetford toilet cassette identification are among the most common from owners upgrading or servicing their rigs, particularly those inheriting a used van and discovering a toilet with no visible labelling.

Frequently Asked Questions

Where exactly is the model number on a Thetford cassette toilet?

The easiest place to check is the data sticker on the toilet base or inside the cassette access area, found after removing the waste cassette. Generally, there is a data tag on the back of the toilet, this can be a tight fit to reach, but it can sometimes be on the base of the toilet, depending on the model. Taking a photograph with a mobile torch works well in confined spaces.

How do I tell if my C400 or C500 is left-hand or right-hand access?

The waste tank access will be located on the right side or left side while you are sitting on the toilet. Access is designed to open toward the outer wall of the caravan or motorhome through the outside access door. Sit on the toilet, look down at the service door side, and that is the access orientation you need to quote when ordering a replacement cassette.

Can I fit a newer wheeled cassette in my older C200 or C2/C3/C4 toilet?

Yes. Do not rely only on the caravan 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. This is one of the few cross-generational compatibility upgrades that works without modification.

My sticker is completely unreadable. What should I do?

Do not rely only on the caravan the cassette, toilet opening, and service-door area. Look for moulded part numbers on the cassette, seat, blade handle, or pump parts. If that still does not yield a result, Thetford's own guidance suggests sending photographs to their support team alongside details of the flush type and cassette access direction.

How often does the waste cassette need emptying?

Empty the waste-holding tank when it is full or starts to smell, typically four to five days for Thetford Blue products and three to four days for Thetford Green products. Most caravan cassettes hold between 15 and 19 litres. If you are emptying more frequently than expected, check whether the correct toilet additives are in use and that the blade seal is fully closing after each flush.

Sources

1. Identifying Your Thetford Cassette Toilet Model, CaravansPlus. Practical identification guide covering data sticker location, cassette shapes and access styles. Do not rely only on the caravan

2. Cassette Toilets Overview, Thetford (International). Full product range including C200, C220, C250/C260, C400 and C500 series. https://www.thetford.com/en/bathroom/cassette-toilets/

3. C2-C3-C4 Series Support, Thetford. Production history 1987-2006, data badge guidance, spare parts list. https://www.thetford.com/en/thetford-service-and-support/c2-c3-c4-series/

4. C200 Series Support, Thetford. Data badge location, repair instructions and troubleshooting. https://www.thetford.com/en/thetford-service-and-support/c200-series/

5. C220 Series Support, Thetford. Flush options, data badge location, repair videos. https://www.thetford.com/en/thetford-service-and-support/c220-series/

6. C400 Series Support, Thetford. Left/right hand access, flush system, parts documentation. https://www.thetford.com/en/thetford-service-and-support/c400-series/

7. C500 Series Support, Thetford. C502C, C502X and C503L sub-models, electric flush system details. https://www.thetford.com/en/thetford-service-and-support/c500-series/

8. Where Is the Serial Number on My Cassette Toilet?, Thetford FAQ. https://www.thetford.com/us/faq/where-is-the-serial-number-located-on-my-cassette-toilet/

9. How Do I Identify My Toilet Model Without a Data Tag?, Thetford FAQ. https://www.thetford.com/us/faq/how-do-i-identify-my-toilet-model-if-it-doesnt-have-a-data-tag/

10. C402C Cassette Toilet, Right Hand Access, Hanna Trailer Supply. Left/right hand identification method. https://www.hannarv.com/P/22358/ThetfordCCCassetteToiletWithElectricFlushRightHandFlush

11. Our Guide to Caravan Toilets, My Generator Australia. C402C specifications and Australian market context. My Generator's caravan toilet guide

12. Caravan Toilet Cassettes Australia, Campera. Thetford's position as the most common cassette toilet brand in Australian caravans. https://campera.com.au/collections/caravan-toilets

13. Cassette Toilets, Thetford Australia, Thetford AU. Australian product range including C200-CS, C223-CS and C263CS ceramic models. https://www.thetford.com/au/toilets/cassette-toilets/

14. Luxury Caravans, Composting Toilets Australia, Luxury Caravans AU. Cassette toilet capacity data and Australian off-grid camping context. https://www.luxurycaravans.com.au/composting-toilets-caravan-australia/