Just did it and you have to use your old Thetford gasket as the Dometic Gasket does not fit the floor flange And I recommend you get a 1 ft flexable steel mesh 1/2in hose with a brass 1/2 adapter to make one end a male connection to fit the female end coming out of the floor, the Dometic has the water inlet lower than the Thetford and you would have to Bend the Plastic pex coming out of the floor too much and it is hard to get it on ,at first I did it without the flexable line and I made it work but it started dripping after a while
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