My parents have a old home and their bathtub faucets started leaking a while back. Unfortunately my dad had someone change the handles and it just made things worse. I'm pretty sure the handles aren't the proper ones. The stem seems wrong.
The water will turn on with the handles but the water pressure is low and the shower won't work. No one can seem to find the old handles and valves.
How could I go about finding out what is the right handle/valve combo when I have nothing to work with? I would have to remove the tile wall to replace the whole thing.