How to Hookup a Dishwasher to a Kitchen Sink

New dishwashers, according to Energy Star, use less water than hand washing dishes. A dishwasher hooks up to the current plumbing of the sink and the garbage disposal unit for water supply and drainage. Installing a dishwasher on your own will save you money, but the novice plumber could find it difficult. Small leaks may appear if the drains are not properly modified for the dishwasher. Always check the installation instructions for brand specific requirements.

Drill
2-inch hole saw
Copper line
Tube cutter
Tube bending spring
Compression nut
Ferrule
Screwdriver
Wrench
Dishwasher tailpiece drain pipe

Instructions

- 1
  Drill through the side of your kitchen cabinet with a 2-inch hole saw so the water lines can be run through.
- 2
  Uncoil the copper tubing that comes with the dishwasher and feed it through the hole. Cut the copper tubing with a tube cutter.
- 3
  Insert a tube bending spring into the end of the copper tube. Shape the tubing so that it fits the water supply valve.
- 4
  Slip the copper tubing over the compression nut and ferrule and attach it to the water supply line.
- 5
  Connect the other end of the copper pipe to the water inlet valve at the back of the dishwasher.
- 6
  Place the drain pipe over the drain of the dishwasher and tighten the metal brace with a screwdriver.
- 7
  Slide the other end of the drain pipe to the dishwasher inlet on your garbage disposal and tighten the metal brace with a screwdriver. If you don't have a garbage disposal, move to the next step.
- 8
  Loosen the drain pipe under the sink with a wrench and poor any water into a spare bucket. Place a dishwasher branch tailpiece drain pipe onto the existing drainage under the sink and tighten it down with a wrench.

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