I've got an old bathroom with 3 handles for turning on hot, cold and shower. The valve in the wall that holds the handles and controls the water has all corroded. I had a plumber come out and he told me I need to replace this but didn't give me a part to order. He said when I receive it he will come and install it. I usually try to do these things myself but this was out of my comfort zone which is why I had him come out after the water kept leaking. Can anyone help me find a replacement for the same size valve. I don't care about the brand so long as I can buy all new handles, etc. Thanks.