Yes, It is quite simple.
Follow these steps:-
Go to:- www.thetford-europe.com
Customer services
User information
Repair instructions
Built in toilets
C200 series
C-200cw
manual pumps
This will give a pictorial layout for replacing your manual
pump.
Have used this web site as an aide when repairing my
loo on a Lunar Clubman.
Best of luck,Happy Camping.
Pete Gullick
April 2007