I have a 2018 400. The toilet is a Thetford. The pedal has a cable in it that runs to the flush/gate valve at the back of the unit. It is similar to the design of a bicycle brake cable. When mine broke, what I did was remove the toilet, find the model number, go to the Thetford site, and order a replacement cable (and lubricate the valve mechanism ). In an emergency, one can reach behind the toilet and activate the valve by hand.
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