[sourdough]

I don't have your trailer but I have replaced 3 Thetford toilets in 3 Keystone trailers and not had a problem. Look at how yours is connected now and the Dometic connection point. They have always been a bit off due to the difference in designs but not enough to be any more than "pull it off the floor and slap the new one in". I will note on this one (new) once connected the Dometic caused the supply line to bend a little and put more pressure on the toilet fitting than I wanted so just removed a little from the entry hole and all was good. A good eyeball on the situation should tell you what you need. I have read of some that replaced fittings etc. on the replacement but do not know why they did it.