Found this under the Thetford toilet capsule. What is it supposed to do?  

I don't have instructions for the thetford nor a parts list so have no idea what this does or where it is supposed to go.

Ideas anyone?

Have a look in this website under toilets and you may find your model number and the part location/usage.

http://www.dometic.com/enau/Asia-Pacific/Australia/Customer-Center/Operation-manuals/

http://thetford.kpnis.nl/web/show/id=69394/langid=42

Cheers,

Sheba.