How to Replace Kitchen Sink Plumbing

Written by robin hewitt Google
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You're ready to replace your kitchen sink or faucet but you have no idea how to remove the plumbing, let alone replace it! Not as scary as it looks, replacing the kitchen sink plumbing won't take you more than an hour with a few basic household tools. Before you know it, your sink will be as good as new, with new pipes and water lines installed by you!

Skill level:
Moderately Easy

Things you need

  • Two water lines (measure for length)
  • Drain pipes with trap assembly (kit)
  • Adjustable wrench
  • Medium pipe wrench
  • Bucket
  • Teflon plumber's tape
  • Towel

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    Remove the Plumbing

  1. 1

    Turn off the water supply by rotating the shutoff valve handles that are located near the bottom of the sink cabinet. They will be directly below the water lines that run to the hot and cold faucets.

  2. 2

    Open both hot and cold water by turning on the faucet/s so that the pressurised water can run out of the lines.

  3. 3

    Unscrew the hot water line where it connects to the faucet, using an adjustable wrench to loosen the bolt. Do the same with the cold water line.

  4. 4

    Detach the hot water line where it enters the shutoff valve by unscrewing the connecting bolt; repeat with the cold water line on the opposite shutoff valve.

  5. 5

    Disconnect the drains by turning the nut at the bottom of the sink drain with a pipe wrench, then unscrew the entire pipe assembly where it enters the main drain near the center back of the cabinet floor. Have a bucket nearby in which to place the drain assembly; the "S" trap will be full of gunky water, so be careful not to spill it.

    Installation of Plumbing

  1. 1

    Wrap the threaded end of the hot water faucet with a 6-inch piece of Teflon plumber's tape, then screw on the new water line. Wrap the threads at the top of the hot water shutoff valve and screw the other end of the hot water line onto the valve. Tighten both ends firmly; do not overtighten. Repeat this process on the other side of the cabinet with the cold water line.

  2. 2

    Fit the bottom end of the drain assembly into the main drain at the bottom rear floor of the cabinet, but do not tighten at this time.

  3. 3

    Adjust the height of the drain assembly so that each side meets the corresponding hole on the bottom of the sink.

  4. 4

    Screw the left side of the drain pipe assembly onto the bottom of the left sink drain and tighten with the pipe wrench until no resistance is felt. Do the same with the right side drain, attaching it to the sink on the right side.

  5. 5

    Tighten the bottom drain assembly where it connects into the floor drain, using the pipe wrench until no resistance is felt.

  6. 6

    Turn the shutoff valves to allow water into the system; open the faucet and check the entire assembly for leaks. If a connection is dripping, tighten it slowly until the drip has stopped.

Tips and warnings

  • If your system has a garbage disposal it will take the place of one side of the sink drain and connect to the drain in the same manner.
  • If your home is older than 20 years measure the water line connections before purchasing new ones.
  • If you're installing a new sink or faucet, attach the water lines when putting the faucet in place, as it's easier to reach them.

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