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How to Install A Dishwasher Drain

Installing a dishwasher drain can be difficult, especially if you don’t have any prior experience.

Not only is it difficult to install a dishwasher drain, but it can also be incredibly frustrating if you’re not sure what you’re doing.

In this article, we’ll walk you through the entire process of installing a dishwasher drain step-by-step. We’ll provide tips and advice along the way to help make the process as straightforward as possible.

Step-by-Step Process for Installing A Dishwasher Drain

If you decide to install a dishwasher drain yourself, there are a few things you’ll need to do. Here’s a step-by-step process:

Step #1: Install the Dishwasher Drain Hose

In installing a dishwasher drain, the first thing you need to perform is the drain hose installation. This hose will connect the dishwasher drain to the garbage disposal or sink.

Use a drill to make a hole in the cabinet wall between the dishwasher alcove and the sink cabinet. The hole should be big enough to accommodate the dishwasher drain hose.

Next, insert the dishwasher hose through the hole and into the kitchen sink cabinet. Be sure to use a rubber gasket or sealant to create a water-tight connection.

Step #2: Prepare the Garbage Disposal Inlet

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To prepare the garbage disposal inlet, disassemble the P-trap and unscrew the tailpiece compression nut using locking pliers. Replace the existing tailpiece with a branch tailpiece. Cut the current tailpiece the same length as the branch tailpiece and install it to the sink drain.

Next, reattach the P-trap to the branch tailpiece and screw on a dishwasher drain adapter. Hand-tighten the discharge line nut clockwise until it’s snug against the adapter. Then use the locking pliers to tighten it an additional 1/4 turn.

Also, make sure that you have removed the plug or plastic disk from the garbage disposal inlet. Use a screwdriver that can fit into the port, and then smash the screwdriver with a hammer to break the plug or disk.

Step #3: Install an Air Gap If Necessary

If you live in an area with a private sewage system, you’ll need to install an air gap. This simple device equalized the water pressure in your drain line and prevents contaminated water from flowing back into the dishwasher.

To install the air gap, remove the cap from the top of the unit. Next, use a drill to make two holes in the sink deck or countertop. The holes should be about 2 inches apart.

Then, insert the air gap inlet into the holes and secure it in place with the screws that come with the unit. Finally, reattach the cap to the top of the air gap.

Step #4: Connect the Drain Hose to the Dishwasher Machine

Now it’s time to connect the dishwasher drain hose to the dishwasher machine. Start by unscrewing the knockout plug from the side of the dishwasher.

Next, insert the dishwasher drain hose into the opening and then screw on a hose clamp to secure it in place. Be sure that the clamp is tight enough so that there are no leaks. Finally, reattach the knockout plug to the side of the dishwasher.

Step #5: Test the Dishwasher Drain

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Once you’ve finished installing the dishwasher drain, it’s important to test it to ensure that there’s no leaks through your drain pipe. To do this, run the dishwasher through a cycle and check for leaks.

If you do find a leak, it’s likely that the hose clamp is not tight enough. Unscrew the clamp and then tighten it until the leak stops.


Installing a dishwasher drain is a little bit complex process, and some steps require knowledge of plumbing. However, if you are persistent in doing it yourself, this guide will surely help you.

If you’ve tried and failed to install a dishwasher drain yourself, or if you don’t feel confident in your ability to do so, then it’s best to call a professional plumber or appliance technician. They will be able to install the drain quickly and efficiently, and they can also help identify any potential problems before they become major issues.

Our team at Quality Appliance Repair will gladly help you with your dishwasher drain installation. We have networks of appliance technicians throughout Australia who can provide you with assistance, no matter where you are located. Give us a call today, and we’ll be happy to help!

Frequently Asked Questions

Can a dishwasher drain directly into the waste line?

No specific plumbing code states that a dishwasher drain line must be looped up to the countertop before falling into the waste line. However, most dishwasher manufacturers require you to install an air gap to prevent contaminated water from flowing back into your dishwasher.

Why does the dishwasher drain hose need a loop?

The loop in the dishwasher drain hose is crucial because it prevents used or dirty water from flowing back into your dishwasher, this is also called the high loop method.

If the water can flow back into the dishwasher, it could contaminate your dishes and cause potential health risks.

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