What is the procedure for replacing the flush valve assy on a san raphael toilet. it is a one piece tank and bowl assy and must install from the inside of the tank. it appears to possibly rotate into place after forcing the old assy out.

If you purchase the flush valve from Kohler, it comes without instruction. Rotation is the key to removal. First note the exact orientation of the assembly before attempting removal. Unhook the flapper chain and remove the flapper. The old assembly does indeed rotate in either direction for removal. I used a counterclockwise motion. (it was a tough turn, don't break the bottom of the bowl where the valve seat is located.) Then install the new foam gasket on the assembly. The new assembly is replaced in the reverse manner. I removed the new flapper from the flush valve for ease of install. You must put significant downward pressure on the flapper seat while rotation is accomplished. Orient the assembly as was the old one. Replace the flapper, connect the chain and observe the flapper for proper opperation.

On under side of toilet you should see a nut. remove this to lift out and replace flush valve.