Roman tub faucets install on the top of a bathtub. They have two handles, one operating hot water and the other operating cold, along with a separate spout. The handles and spouts are not connected, so each is installed in a separate hole. Replacing these faucets requires skill and takes about an hour or two, depending on your faucet and experience. Before you attempt this task, get all your tools and parts ready.
Turn off the water to the bath by closing the water valves in the bath walls. If the valves are not accessible, shut the home's main water lines near the water heater.
Remove the set screw in the side of the roman tub faucet handles with an Allen wrench and pull the handles up and away from the tub surface.
Unscrew the washers at the base of the handles that secure the cartridges in place. Remove cartridge retaining clips if present by sliding them off the side of the faucet cartridge. Or turn the cartridges counterclockwise to unscrew them. Pliers will assist with this task. Pull the cartridges out of the base once this retaining mechanism is removed.
Unscrew the retaining screw with an Allen wrench. It is on the back of the spout. Some models have a plastic cap on the screw; remove this first. Pull the spout up and off the tub surface. Install the new tub spout onto the spout deck and tighten the retaining screw with an Allen wrench. Install the cap by pressing it in place if your faucet has one.
Install the mounting hardware, including washers or adjustable mounting decks on the handle bases by screwing them in place. Apply plumber's putty around any non-gasketed mounting hardware fitted directly to the tub surface.
Install the new cartridges for your Roman tub faucet and either turn them to screw them into the base or install the proper set screws to hold them in place. Each roman tub faucet is different and has a different way of securing the cartridges in place. Check your product literature to determine the proper method for your faucet. Slide the new handles over the cartridges and tighten the set screws.