Plate Kit of the Thetford C400 Holding Tank

Thetford C-400 Holding Tank Mechanism - Right

£37.99 (inc VAT) £46.99NewCondition
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Thetford C-400 Holding Tank mechanism - Right. Thetford part number 32331. Colour grey.

How to Identify if you have a right-handed or left-handed toilet
When you are sat on the toilet inside the caravan or motorhome, if the wall to the outside of the caravan/motorhome is on your left then you have a left-handed toilet. If the exterior wall is on your right then it is a right-handed toilet. (Please note that the photo may not be the correct handed part)

13 Customer Reviews on Thetford C-400 Holding Tank Mechanism - Right


by (28 May 2019)
5 star review(5/5)
As described, prompt delivery, great service

Easy With You Tube

by (09 Apr 2019)
4 star review(4/5)
Straightforward replacement of THETFORD C-400 HOLDING TANK MECHANISM - RIGHT after watching you tube video.Causes some confusion as two separate floats for two models and correct one needs attaching. Came on time and as ordered

Easy Replace For Broken Loo

by (02 Sep 2017)
5 star review(5/5)
I purchased a used motorhome which is 10 years old, but hardly used. On the first outing, the mechanism in the cassette tank broke. On inspection I discovered the broken part was the bit that actually seals the tank after flushing. This is a replaceable part at around £8, but I decided to renew the whole mechanism as a precaution against further breakages. I found the 'fresh up kits' at around £90 and this replacement mech at leisure shop direct at a much better price. The order arrived very quickly and fitting was a doddle. I've lubricated the seals, which I probably should have done in the first case and we're good to go. The instruction for fitting are really clear and fitting literally takes two minutes. This C400 holding tank mechanism fits the C500 as well and comes with a spare clip for the float plus a second float for the C 500 Just make sure you get the right model for your loo though. A right hand loo has the cassette emptying door on the right hand side as you sit on the loo.


by (11 Jul 2017)
5 star review(5/5)
Great 5star service

Best Option For Renovating Leaking Cassette

by (09 Jul 2017)
4 star review(4/5)
One of our cassettes is about ten years old and all its the seals were leaking. Cleaning and replacing them is unpleasant, time consuming and fairly costly. Using a new a new complete mechanism required only removing the old one, cleaning the edge groove, fixing the new float (one minute) and inserting the new mechanism. The whole process took less than five minutes and was reasonably clean. The result was a cassttee that worked as new, without any seepage.

Replacement Thetford Slide Valve

by (14 Sep 2016)
5 star review(5/5)
The slide valve arrived on time, fitted straight on to my holding tank no problems and very simple to fit

Excellent Service

by (01 Sep 2016)
5 star review(5/5)
The item was a replacement for the cassette toilet holding tank mechanism. Easy to order, well packaged quick to arrive and easy to replace the old part. A helpful and friendly company to deal with


by (01 Sep 2016)
5 star review(5/5)
Bought Thetford holding tank valve - good price, came promptly and as described, worked fine. Happy customer!

Easy Ordering, Fast Delivery - Good Transaction

by (21 Apr 2016)
5 star review(5/5)
Title says it all. One of the free does that had the party I needed. Great descriptions meant I had no doubt about which part to buy. Ordered, waited while update emails arrived , it arrived, it fitted. Happy days!

Superb Idea

by (05 Sep 2014)
5 star review(5/5)
This is a great product and an easy way to make your worn cassette like new.

Thetford C400 Holding Tank Mechanism

by (24 Aug 2011)
2 star review(2/5)
A distress purchase but a 'must have' item so no choice. Third mechanism fitted in 4 years, evidently a common fault with this Thetford toilet. We bought a spare as it always fails when you are away from home. Easy to fit, but messy. Brilliant price and service from Leisure Shop.

Thetford C400 Holding Tank Mecanism

by (20 Jul 2011)
2 star review(2/5)
I have been caravaning /camping for over 30 years and have used thetford products for all of that time with NO problems,the last two vans i have owned both had C400 tanks and BOTH MACANISMS have failed!!! they are flimsy and feeble,NOT up to thier standard in my opinion.

Thetford C-400 Holding Tank Mecanism

by (10 Aug 2010)
4 star review(4/5)
I am a little disappointed that this has needed replacing after three years. We usually wild camp so this represents a maximum of 200 days' use allowing for stays at campsites.
It appears that the blade fixing had worn; as this is the main moving part it should be more substantial or the blade itself could be replaced.
In all other respects the Thetford is an excellent product.

2 Technical Questions on the Thetford C-400 Holding Tank Mechanism - Right


I am needing the mechanism part# 32331. I am wanted to make sure that comes with the actual mechanism piece on the underside that opens and closes when it flushes or is it just the outside top piece..Please call me at 805-210-0425. or please give a number to contact you.. Thanks.


This is our part 137138 and it does include the underside mechanism that opens and closes.


Hello, i have a number of enquires about parts i need for my 2003 Adria adora 532ld. The water inlet socket is a truma crystal 2 compact housing and i'm getting lots of sealing problems, water spurts down the outside of the van even when I set the pressure to the lowest possible setting, do I need to replace this with a more up to date version ? The C402 toilet cassette has had no maintenance for 6 years and the flaps and internal moving parts are getting stuck, is there a repair package for all this? also the flush pump has failed (i've seen your repair page on this) so i would need to order this also


Best to replace the Crystal system with the later Ultraflow inlet, our ref. 149669 in Ivory or 149670 in white.
With regard to the toilet cassette then probably best to replace the mechanism assembly, ref 137137 for a left hand or 137138 for a right hand. The position of the outside wall of the caravan when sat on the toilet determines whether LH or RH.

If you’ve changed your mind about keeping your purchase, please return it in its original condition with proof of purchase and we’ll exchange or refund it. Unless faulty, this should be within 30 days of receiving your order. By original condition, we’d expect this to mean that you’ve kept packaging and labels, and that the item is undamaged and unused.

For further information of how to return your item, please visit the "Returning an Unwanted/Faulty/Damaged Item" section on our Help Page.
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