I would call Thetford:
Thetford’s Customer Service Department at: 1-800- 543-1219. When you call, please have available:
■ Your name and address
■ The toilet model and serial number from ID labels
■ A brief description of the problem

I am guessing I am not going to find a replacement (flush) knob assembly for my Thedford Aqua Magic III. This toilet works great but no luck with finding a replacement knob, which has a fractured collar that fits over the shaft. So I am now pondering replacements. This thing fits on a Thedford base. I am assuming that the toilet itself is bolted to a raised closet flange that lives INSIDE that raised base. Yes I can find all this out by pulling the toilet and seeing what I have inside that base. I don't want to order a new toilet that might be too tall. I see Thedford sells the Aqua Magic V in high and shorter versions. But I don't know that either will mate up with this base. Anyway, I am assuming that someone has lived thru this. I know it is not much of a job but I don't want to pull the toilet without having the replacement at hand. If we chose the go camping, we can still use this toilet with a pair of needle nose vise grips doing the job of that flush control knob. Thanks.