The faucet box sits behind the washing machine (typically 42 inches above the floor) and surrounds the hot and cold water valves. Most are made of hard plastic or vinyl and are screwed onto two wall studs (vertical framing members). Faucet boxes are durable and rarely, if ever, need replacing. But should yours break, buying a new one and replacing it is a relatively simple job, well within the skill set of a competent do-it-yourselfer with a few basic tools.
Things You'll Need
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Shut off the water at your home's main cutoff valve; it's usually in the basement or wherever your water supply lines enter the house.
Unscrew the hoses from the two valves in the faucet box. Drain the hoses and set them aside.
Unscrew the valves with the wrench. Set them aside.
Unscrew the four screws holding the faucet box in place. Set the screws aside and discard the box.
Set the new box in place so that it aligns with the plumbing pipes. Insert the screws and drive them into the box and studs.
Reattach and tighten the valves. Reattach and tighten the washing machine hoses.