These faucets are special to CFTs they have 2 3/8"; centers. Some units have 1/2"; and some have 3/4"; water connections at the back. The 3/4"; needs special CFT supply pipes. Most older faucets are not code and it is still easy to buy non-code faucets. The code is that the faucet spout must have a gap of at least 1"; between the top of the tub rim and the bottom of the spout - that's so bath water in the tub cannot siphon back into the drinking water supply.