Need to replace the pump in your Thetford C200 toilet then worth looking at this video at https://m.youtube.com/watch?v=CNbznuzQV-4
I found some useful tips how to do it when I recently replaced the pump.
a collection of top tips, tricks and ideas, DIY improvements and motorhome modifications that can also be made to caravans, campervans and RVs. Many of these modifications I have made and used on our own motorhome but I have also listed other tips, advice and product reviews that I have found on the Internet including ideas for day trips and visits.
Motorhome Mods UK 