My thetford c4 cassette toilet leaks from the header tank where a blank plug is fitted.The toilet can be fitted to the left or right hand side and the plug replaces the filler pipe. Unfortuneatly it is an arms length away and out of sight except by use of a mirror and can only be touched with finger tips. It appears to be tight but weeps a cup full approx when you drive around even if the tank has been emptied as not everything seems to come out. I know it is the header tank because what appears on the floor has the bluetinge I have added to the water. Proper access would mean removal of the complete toilet and a lot of making good. I intend smothering it with silicone sealant unless anyone has a better idea!

Ivor Hancock, May 2009

hi
I have had the same problem and took the toilet header tank out and as you suggested did the silicon thing it is now leaking again so it looks like it will have to come out again this time i will take the lot to a caravan centre and see if the mechanics have an answer

john hope, July 2009

Yes Thetford might come up with a better solution
www.thetford-europe.com uk
www.thetford.com.ae for those in Australia [yes emails from their as well but not allowe to add email addresses now.
Follow these instructions for downloads and on I think second page is 'ask thetford'.put it to them and meanwhile download your toilet repair pdf's.
UK www.thetford-europe.com
Australia www.thetford.com.au
Australia site has stockist list.
FOR UK USERS.
HOME PAGE SELECT ENGLISH {if in Australia forget this selection
NEXT PAGE SELECT CUSTOMER SERVICE (tope line)
NEXT PAGE SELECT USER INFORMATION (left of pic)
NEXT PAGE SELECT REPAIR INSTRUCTIONS (left of pic)
NEXT PAGE SELECT BUILT IN TOILETS [top right of pic]
NEXT PAGE SELECT C2, C3., C4 (or relevant) or select your model
NEXT PAGE PDF Files YOU ARE NOW IN PDF FILE LIST

Bob, May 2009