The new trend in home construction is to put the dishwasher and washing machine in the kitchen or a nearby closet or pantry. Having these machines close to where you need them makes everything so much easier.

Drain Cleaning Sacramento

But it also means you’ll be installing plumbing lines and tubing for the discharge of wastewater, as well as water supply lines and hookups. As we’ve provided a list of what you need to know when installing a plumbing line for your dishwasher and washing machine.

Check the Drain Hose

The drain hose on your washing machine must be connected to the Y fitting, which in turn connects to the main drain line. The drain hose must be securely attached to the machine’s discharge port and the Y fitting. Make sure your drain hose has no kinks or bends, as this could cause backups.

Prepare for Install

Turn off the water supply and disconnect the existing drain line from the wall. Disconnect both ends from your washer and dryer, if present. Using a bucket, catch any remaining water in the lines. If you have a floor drain nearby, you may be able to skip this step.

Check the Inlet Hose

The inlet hose is responsible for delivering water to your dishwasher. Use a pipe wrench or pliers to disconnect it from your sink faucet or dishwasher. Most inlet hoses are made of flexible rubber, so they can easily be disconnected by hand in some cases. 

Install Valves

Remove about 12 inches of copper pipe from each line by turning off the hot and cold water valves under the sink with a pipe wrench. Install shut-off valves on each side of this gap, taking care not to overtighten them because they are made of plastic.

Connect the Y Fitting to the Valves

Install a Y fitting on one of the valves with sweat solder joints. Cut two lengths of 1/2-inch copper pipe long enough to reach from here to each appliance, plus an extra inch or two for error. Install these with sweat solder as well.

Connect the Discharge Tubing to the Y Fitting

Waste from both appliances will be routed through a single line. The washing machine drains into a standpipe, and the dishwasher drains into the standpipe via an air gap. The air gap protects against backflow from the dishwasher in case there is a problem with either the dishwasher or standpipe.

Connect the Tubing to the Washing Machine Discharge Port

Connect one end of your tubing to the washing machine discharge port (above). The discharge port might be on top of or behind the washer. Make sure you have enough tubing so you can get it up to the Y fitting afterward.

Connect the Tubing to the Dishwasher Inlet Port

Connect one end of your tubing (above) to the fitting on top of your dishwasher inlet valve (below). This connection is usually easy and obvious, but check your owner’s manual for any specific instructions.

If you’re not sure and confident in your abilities to complete the job on your own, contact Sacramento Repipe & Plumbing immediately to book a free estimate. Our skilled and helpful plumbers can assist you with any do-it-yourself project; the consultation is complimentary!


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