How to Hook Up the Drain Line on a Bosch Dishwasher

Written by c.l. rease
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Installing a Bosch dishwasher drain line entails connecting the dishwasher to either a dishwasher connection piece or a garbage disposal. A dishwasher connection is a fitting that installs vertically under the sink, which has a Y-branch sized to match the dishwasher drain line. Connecting to a garbage disposal requires you to connect the drain line directly to the dishwasher drain connection on the garbage disposal housing. If the building codes in your area require an air gap, you'll need to route the drain line to the air gap, and then into the garbage disposal or dishwasher connection fitting.

Skill level:
Moderately Challenging

Things you need

  • Dishwasher connection fitting
  • Drill
  • 1-inch spade bit
  • Dustpan and brush
  • Supplied drain line and clamps
  • Pliers
  • Utility knife

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  1. 1

    Inspect the drainpipe coming from the bottom of the sink. If you have a garbage disposal, locate and remove the dishwasher drain cap and continue to Step 4. Proceed to Step 2 if you do not have a garbage disposal.

  2. 2

    Disconnect the pipe connection between the sink and the P-trap by loosening the hand-tightened threaded fitting holding the pipe secure.

  3. 3

    Remove the vertical section of pipe with the dishwasher connection fitting. Secure the fitting with the Y-branch facing in the direction of the dishwasher.

  4. 4

    Insert the spade bit into the drill motor. Drill a hole in the cabinet panel separating the sink from the dishwasher cavity. Keep the hole as close to the base of the cabinet as possible.

  5. 5

    Clean the wood shavings from both the sink cabinet and the dishwasher cavity located beneath the countertop with the dustpan and brush.

  6. 6

    Attach one end of the drain line to the outlet of the dishwasher with one of the supplied clamps. Open the clamp by pulling the tabs together. Release the tabs to secure the drain line.

  7. 7

    Slide the loose end of the drain line through the hole that you drilled into the cabinet wall in Step 4.

  8. 8

    Attach the additional plumbing lines to the dishwasher and slide the dishwasher into place, while you pull the drain line through the hole in the cabinet wall.

  9. 9

    Cut the drain line to length with the utility knife, after the mounting the dishwasher per the installation instructions.

  10. 10

    Slide the other clamp over the loose end of the drain line. Secure the drain line to the drain connection Y-fitting or the garbage disposal.

  11. 11

    Check the drain line for leaks after you run the dishwasher for the first time.

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