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Home - Thetford - Cassette C403

Thetford Cassette C-403 Caravan Toilet

A luxury chemical camping toilet for caravans and motorhomes

Thetford cassette Toilet

The Thetford Cassette C-403 Caravan Toilet is a high quality chemical toilet that is designed to be installed in motorhomes and caravans and is the same as the C402 caravan toilet except it can be connected to the main water tank in your caravan or motorhome.

Luxurious and accommodating features

The Thetford Cassette C403 caravan toilet has a 19.3 litre waste tank and a 15 litre flush water tank capacity. The holding tank on the Thetford C403 caravan toilet has wheels, a convenient retractable handle for easy transportation and a removable working mechanism making the inside of the tank easy to clean and maintain.

Available with left or right handed electric flush

This motorhome chemical toilet also has an electric flush, LED waste tank level indiator and an integrated no splash pour spout and is available with the flush on the left or right hand side, making the Thetford C-403 adaptable to your specific needs.

  • Electric push button flush
  • Waste holding tank on wheels
  • LED display indicates when waste tank is full
  • Integrated no-splash pour spout
  • Waste tank capacity: 19.3L
  • Flush water tank capacity: 15L
  • Available with the flush on the right or left hand side

thetford c403 caravan toilet dimensions

thetford cassette c402 caravan toilet

For more information please call us on 0151 334 0222

Thetford Cassette C-403 Caravan Toilet - Right Hand Flush

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Thetford Cassette C-403 Caravan Toilet - Left Hand Flush

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next working day delivery

Thetford C403 installation manual

ThetfordSanitation Products / Chemical Additives

To ensure the efficient operation of chemical toilets, it is necessary to use toilet additives. Thetford offers a complete range of toilet additives to suit the varying needs of mobile toilets for camping, caravanning and domestic use.

What do Thetford toilet additives do? …Thetford waste holding tank additives reduce unpleasant odours and gas build-up. They break down waste matter in toilet holding tanks and prevent clogging. They also prevent deposits from sticking to the inside of waste tanks. Toilet additives are necessary to make mobile sanitation systems work trouble free. Our flush water tank additives keep the water ‘fresh’, ensures a smoother, better flush and leaves a protective film in the toilet bowl.

What types of additives are available for chemical toilets? …There are additives for the waste holding tank, for the flush water tank and there are maintenance products.  Your chemical toilet in general requires two main chemicals, the chemical for the bottom "waste" tank, either Aquakem blue or green is suitable and is essential, and flushing fluid "Aqua rinse" which is optional and is added to the flushing water top tank.  Although Aqua Rinse is not essential it makes usage of a chemical toilet a more pleasant experience.

thetford porta potti toilet chemicals

thetford aquakem blue

AquaKem Blue Waste Tank Additive

AquaKem Blue breaks down waste matter and controls odours in all portable toilets and Porta Potti’s. Aquakem Blue is not suitable for use with Septic Tanks.



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thetford aquakem green

AquaKem Green Waste Tank Additive

Aquakem Green is both powerful and effective at neutralizing waste and is suitable for use with septic tanks too.




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thetford aquarinse pink

AquaRinse Pink Water Tank Additive

AquaRinse Pink is use to keep the water in the flush tank fresh, it also leaves a protective film over the toilet bowl.




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thetford tank freshener

Thetford Tank Freshner

Thetford Tank freshener fluid, reduces deposits and grease contamination in tank and pipework in cassette. For use in Thetford and other portable toilets.
Pleasantly pine scented
Safe for use with all plastics.

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Thetford Triple Pack

The Thetford triple pack contains everything you need to get started using your toilet. It includes:

  • 1.5 Litres AquaKem Blue
  • 1.5 Litres AquaRinse Pink
  • 4 Pack of AquaSoft Toilet Rolls

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thetford aquasoft toilet rolls

Aqua Soft Toilet Rolls

Aqua Soft toilet rolls specially formulated for chemical toilets, Aqua Soft toilet rolls dissolve easily and do not block tanks or waste valves. 4 Pack

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