Thetford Toilet Cassette Maintenance




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Thetford Toilet Cassette Top Tip

Before we start discussing maintenance of the Thetford toilet cassette, did you know you can buy a freshen up kit which comprises of a new toilet seat and a new cassette. So, if you’ve just bought a second hand caravan and don’t want the hassle of using something someone has been happily sitting on and depositing into for years, you can get lovely clean new stuff. So, no need to read the rest of this article, just buy one of these… ( Make sure you buy the correct one )

Thetford 9338262*
  • With adapter c250 c260
  • Style: Vehicle specific
  • Country of origin is Spain
  • The package dimensin of the product is: 11.4lbs
Thetford 2334062 Caravan Motorhome Cassette Fresh Up Kit C200*
  • Holding tank for Thetford C200 series ( capacity 17 liters )
  • The Toilet fresh-up Set is an easy and economic way to make a used Cassette Toilet as good as new
  • The set includes: Seat & Cover and Waste-holding tank with wheels!
Thetford Fresh Up C 2,3,4 | Right or Left | Toilet Seat | Tank with Wheels*
  • Suitable for all C 2 – 3 – 4 toilets.
  • Hygiene for your toilet.
  • Contents of delivery: 1 x tank with wheels, 1 x toilet lid.

You didn’t buy one? Read on my friends…..

Unlike the toilet at home, it’s not a flush and forget affair. Things need doing and doings need getting rid of. It’s not just some magic hole where everything just disappears into never to be seen again. Unless of course you work at a sewage farm, where you’d see it again everyday. Toilets are a serious matter and they are not to be sniffed it, so let’s take a look at one.

The toilet cassette is this thing right here:

Thetford Toilet Cassette

Thetford Toilet Cassette Parts

Looking at the Thetford toilet cassette there’s a number of parts. No need to memorise them all, unless you’d like to…(Your specific toilet may differ to the one shown below)


Firstly, the pour out spout (29) where you empty the loo from. Remove the cap (28) and poor out the contents. The cap is also a measure.
Just below the spout is the handle, where you can hold the cassette.
Below that is a large circle (4 waste holding tank plate) with an orange knob (1 blade opener), this operates the flap, which you open to flush water through to give it a good clean after emptying. Before doing that though you need to remove the flap by sliding it towards the handle. This whole piece can also twist out for even easier cleaning, probably at the end of the season.

There are obviously two wheels (32) and at the top is a pull out handle, which makes it easier to get the the disposal point. Lastly, is the little orange button at the bottom. When emptying you can press this and it lets air in to help move the contains quickly through the pipe

Pink, Blue or Green Fluid?

You may have seen toilet fluid, it comes in different colours, but which colours are used where?

Pink is to be added to the water that flushes to toilet

Green and Blue do the same thing. It’s added to the toilet cassette and breaks down all the nasty stuff in there. Green, as you can probably guess is more environmentally friendly. Blue contains all sorts of chemicals. Where you need to be careful is when a site uses something like a septic tank which breaks down toilet stuff naturally. Don’t use blue in this case, only green. If in doubt either use green or ask.

Thetford Toilet Cassette – Cleaning

Water can be used to flush clean the thetford toilet cassette through and it’s probably advisable to wear some kind of rubber gloves, better safe than sorry. There are various toilet cleaners you can use, but we mainly flush with water thoroughly

Bestseller No. 2
Aqua Kem Duo Tank Cleaner 0.78L*
  • Removes limescale, encrusting and grease deposits
  • Technical parts inside the tanks are cleaned as well
  • Prolongs the lifespan of the tanks
  • No scrubbing required!
  • Cleaning without damaging the technical parts inside the tanks
Bestseller No. 3
Thetford 500592 Toilet Care, Orange*
  • For long-lasting freshness and hygiene of your 2 tanks. A 800 ml bottle allows you to either 4 cassette cleaners (4 x 200 ml) or 1 cassette cleaning (200 ml) + 1 grey water tank cleaning (600 ml). It is used in addition to the Grey Water Fresh concentrate. 500577 Use 2 to 3 times a year for optimal results.
SaleBestseller No. 4
Thetford Toilet Bowl Cleaner 750ml Chemical Caravan Boat Motorhome*
  • Thetford Toilet Bowl Cleaner 750ml Chemical Caravan Boat Motorhome
  • Brand : Thetford
  • Product type: CLEANING AGENT
  • 750.00 ml Pack of 1
  • cleaning spray cleaner clean motorhome boat toilet potti caravan chemical motorhomes portaloo living exterior outdoor boats outdoors bowl
SaleBestseller No. 5
Thetford 30459CO Toilet Fluid and Rinse Concentrate Duo Pack, Blue & Pink, 1.53 Litre*
  • Duo pack containing a 780ml bottle of Aqua Kem Blue Lavender concentrate and a 750ml bottle of Aqua Rinse concentrate; Aqua Kem Blue; Powerful and easy to use toilet fluid for the waste holding tank; Outstanding odour control; Liquifies waste for easier tank emptying; Reduces gas build-up; Aqua Rinse Plus; Forms a protective layer to block build-up and bacteria; Highly effective for a smoother flush; Improved formula keeps flush water clean

Thetford Toilet Cassette – Maintenance

As this is the title of the article, we’d better get around to some maintenance. Other than keeping it clean there’s not a great deal to do. You need to lubricate the seal on the part that opens underneath the toilet bowl. You can use olive oil, just open the door by twisting the knob beside the hole and use olive oil to lubricate the seal. You can also use Thetford Seal Lubricant

Thetford Siliconenspray*
  • Regular application on the valve seal ensures its flexibility and durability
  • Thetford Lubricant Spray
  • Brand: Thetford.

There is a possibility that the float may get stuck, toilet paper can get stuck around it and make it stick in the “full” position. To clear this open the sliding cover that covers the hole half way and push in an anti clockwise motion to remove the plastic casing that holds the seal. (See our video below) This way you can get access to the float which is in one of the corners, just have a feel around (with gloves on) and see if you can free the float. Don’t force it. It in doubt just fill it with water and give it a little shake to dislodge any loo roll.

The handle can come loose. Simply pop the top of the handle off, but getting a blunt knife in the gap, just below the word “Thetford” and it will expose screws. You can re tighten these and pop the piect you just popped off back in place.

Thetford Toilet Cassette Spares

Bestseller No. 1
23721 Compatible with Thetford Cassette Lip Seal 110 mm for C200 C250 C400 C500 C2 C3 C4 Caravan Motorhome Toilet Waste Tanks*
  • Toilet Cassette Lip Seal Part Number: 23721
  • Fitment Vehicles: Compatible With Thetford Cassette Toilet Lip Seal C200 C250 C400 C500 C2 C3 and C4 models,Please note this will only fit models after June 2000.
  • The Full Diameter is 110mm,The inner diameter is 80mm, note to check whether the size matches your model.
  • Easy to insert and install, direct replacement for damaged and old toilet cassette lip seal
  • NOTE: Please check the original manufacturer part number before purchasing to ensure the part is suitable. In case of product damage or receipt of a product that does not correspond to the actual product, please contact us as soon as possible. We actively help you deal with the associated problems.
Bestseller No. 2
YUCKMZ Compatible With Thetford Cassette Toilet C250 C260 Replacement Spare Holding Waste Tank Mechanism 5072706
21 Reviews
YUCKMZ Compatible With Thetford Cassette Toilet C250 C260 Replacement Spare Holding Waste Tank Mechanism 5072706*
  • OEM Number: 5072706,50727-06
  • Fits: The Replacement Spare holding tank mechanism compatible with Thetford C250 & C260 SC250/260
  • Material: The Waste Tank Mechanism is made of high quality material, just turn to remove old one and vice versa.
  • Please compare your original before buying to check if this toilet waste tank kit is what you need.
  • Flap Blade Opener Mechanism Holding Tank Mechanism Waste Tank Mechanism
Bestseller No. 3
cantondz Compatible with Thetford Toilet Cassette C250 C260 5072706 Replacement Spare Holding Waste Tank Mechanism*
  • Fitments: Compatible with Thetford C250 & C260 SC250/260 Spare holding tank mechanism
  • Reference Part Number: 5072706, 50727-06
  • Premium Material: This Toilet Waste Tank Mechanism is made of high quality material to ensure stable performance and durability.
  • The Waste Tank Mechanism is easy to disassemble and assemble, just turn to remove old one and vice versa,requires no tools and is easy to use.
  • If you have any problem in our products, please feel free to contact us. We will try our best to give you a satisfied answer within 24 Hours
Bestseller No. 4
Thetford Screw measuring cap 25810-78*
  • Country of origin: Netherlands
  • Package weight: 7.2 kg
  • Package dimensions (L x W x H): 225.0 x 121.0 x 74.0 mm
  • Colour: yellow
SaleBestseller No. 5
Thetford 50727-06 Plastic Fecal Tank, Grey*
  • Colour: grey
  • Highly Efficient
  • Easy to Use
Bestseller No. 6
  • The sliding cover will fit C2, C3 and C4 models
  • Item Package Length: 23.8 cm
  • Item Package Width: 13.0 cm
  • Item Package Height: 8.2 cm
Bestseller No. 7
YUCKMZ 23721 Compatible with Thetford Cassette Lip Seal, 110 mm Lip Seal For Toilet Cassette Tanks C2 C3 C4 C200 C250 C400 C500 Caravan Motorhome*
  • Fitment: Compatible With Thetford Cassette Toilet Lip Seal C200 C250 C400 C500 C2 C3 and C4 models,Please note this will only fit models after June 2000.
  • Toilet Cassette Lip Seal Part Number: 23721
  • The Full Diameter is 110mm,The inner diameter is 80mm, note to check whether the size matches your model.
  • No. 23721 Slide Seal, Lip Seal for Waste Tanks, Toilet Cassette Tank Lip Seal, Direct replacement of the old or broken toilet cassette lip seal.
  • Please compare your original before buying to check if this kit is what you need.
Bestseller No. 8
Thetford C400 Cassette Waste Tank Right Hand Spare Replacement Caravan Motorhome Toilet*
  • Model Number: 26634
  • Item Package Quantity: 1
  • Package Weight: 2879.97 grams
  • Package Dimensions (L x B x H) in cm: 72.8 x 27.8 x 24.6
Bestseller No. 9
Thetford C250 Toilet Fresh-up-Set*
  • White River Outdoor have a lifetime of experience and enthusiasm for all things outdoor
  • Item Package Length: 29.0 cm
  • Item Package Width: 38.0 cm
  • Item Package Height: 49.0 cm
Bestseller No. 10
Thetford C2 C3 C4 Cassette Vent Button & Spring*
  • Model Number: 07524-78
  • Item Package Length: 15.0 cm
  • Item Package Width: 7.0 cm
  • Item Package Height: 5.0 cm

Thetford Cassette Toilets – Full Range

Thetford Toilet Cassette Maintenance Our Video

YouTube player
I make a fool of myself with rubber gloves, showing you the cassette

For a practical video on replacing your Thetford toilet cassette seal, see the below

YouTube player
Replacing Thetford cassette toilet seal

*Last update on 2024-05-21 / Affiliate links / Images from Amazon Product Advertising API

About the author

2 responses to “Thetford Toilet Cassette Maintenance”

  1. Jim markland avatar
    Jim markland

    Why does the maintenance video not play, I’m having trouble with the full light not working

    1. CaravanVlogger avatar

      Sorry you’re having issues, it plays ok for me? You could view from our youtube channel too.
      Re light, it could be that the “float” is stuck? Try giving the cassette a good rinse out, may dislodge it.

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