Try Thetfords site free pdf downloads. Also you can send them a question on the 'Ask Thetford' page watch for it in the following once your on their site. It might be a case of lubricating new rubbers.
UK	www.thetford-europe.com	
Australia	www.thetford.com.au          (Even get request from Australian campers)	
	Australia site has stockist list.	
HOME PAGE 	SELECT 	ENGLISH {if in Australia forget this selection)
NEXT PAGE	SELECT 	CUSTOMER SERVICE (top line) 
NEXT PAGE	SELECT 	USER INFORMATION  (left of pic) also 'Ask thetford' is on this page.
NEXT PAGE	SELECT 	REPAIR INSTRUCTIONS   (left of pic)
NEXT PAGE	SELECT 	BUILT IN TOILETS  [top right of pic] 
NEXT PAGE	SELECT 	This is where you select your toilet range. Search alll if unsure of type/range
NEXT PAGE	PDF Files	You should be in the pdf folder list on your Thetford toilet. Start downloading.
To direct link to the Thetford download site type in the following		
www.thetford.eu/web/show/id=51498/langid=42		
Don't bother for Thetford fridges they tell you for safety reason to take it to a service centre
                
 bob
                
 August 2009