How to Install Water Lines For a Vanity Cabinet From the Floor

Clean the outside of each pipe stub coming through the floor with an emery cloth. This provides a dirt-free surface for installing the in-line shut off valves.

Wrap the threads on both ends of each shut-off valve with plumber's tape. Wrap the threads under each faucet connection with plumber's tape. The plumber's tape helps to seal the threads and prevent leaks.

Slip a compression nut over each pipe stub with the threaded end of the nut pointing away from the floor. Compression nuts look like caps with a hole in the center. Push a ferrule -- a concave ring washer -- over the end of each pipe stub until the ferrule is 1/4-inch past the end of the pipe.

Push the larger end of the shut-off valve over the end of one of the pipe stubs. The handle of the shut-off valve should face away from the rear wall. Thread the compression nut over the threads of the shut-off valve until the nut is hand tight. Tighten the nut another three-quarter turn with a wrench. Repeat for the second pipe stub.

Thread the connecting nut of each water line steel flex hose to the faucet threads. The connecting nuts on a water line steel flex hose are similar to the connection between a garden hose and outside spigot. Tighten the connection with a faucet wrench.

Screw the opposite end of the water line steel flex hose to the proper shut-off valve. The hot water line connects to the left shut-off valve and the cold water line connects to the right shut-off valve. Tighten the connections with a wrench.

Turn both shut-off handles clockwise until they stop. Turn on the main water supply to the house. Turn on both faucet handles. Slowly turn the shut-off valve handles counterclockwise to supply water to the faucet.

Wait for the water to run through the faucet evenly. Initially the faucet will spurt as air is expelled from the lines. Check the connections for leaks and tighten any leaky connection another quarter turn with a wrench.