How to Install Dishwasher Drain to Double Sink

Are you tired of your wet and dirty dishes piling up in the sink? Installing a dishwasher can make your life a lot easier.

How to Install Dishwasher Drain to Double Sink

But what about the drain? If you have a double sink, you might be wondering how to install dishwasher drain to double sink.

Installing a dishwasher drain to a double sink can seem daunting, but with the right tools and a step-by-step approach, it is entirely manageable for any DIY enthusiast.

Connecting the dishwasher drain properly ensures that dirty water is efficiently expelled, preventing potential backflow and ensuring the optimal performance of your appliance.

This guide aims to simplify the installation process by breaking it down into clear, manageable steps, from gathering necessary materials to completing the final connections.

Whether you are a seasoned DIYer or a complete novice, this guide will help you achieve a successful and leak-free installation.

What Will You Need?

Before you begin, it is essential to gather all the necessary tools and materials for the installation process. Here are the items you will need:

  • Dishwasher drain hose
  • Dishwasher connector kit
  • Screwdriver
  • Adjustable pliers
  • Hose clamp (with the appropriate size for your dishwasher hose)
  • Teflon tape (optional but recommended)

It is also helpful to have a bucket and some old towels on hand in case of any spills or leaks.

10 Easy Steps on How to Install Dishwasher Drain to Double Sink

Step 1: Turn Off the Power and Water Supply

Before starting any installation work, ensure your safety by turning off the dishwasher’s power supply.

Locate the circuit breaker that controls the dishwasher’s electricity and switch it off. Next, turn off the water supply to prevent any accidental leaks. Typically, there is a valve under the sink that you can turn off by hand.

Step 2: Prepare the Drain Hose

Locate the Drain Hose

First, locate the drain hose that came with your dishwasher. Carefully inspect it for any damages or kinks that could impede water flow. A clear and undamaged hose is crucial for preventing leaks and ensuring efficient drainage.

Next, measure the length of the drain hose to ensure it will reach from the dishwasher to the under-sink plumbing with some slack.

Too much slack can cause kinks, while too little can pull tightly and disconnect over time. If the drain hose is too long, trim it carefully with a pair of scissors or a knife, making sure the cut is straight and clean.

After confirming the correct length, attach one end of the drain hose to the dishwasher’s drain outlet.

This is typically located at the back of the dishwasher. Secure it tightly using a hose clamp, ensuring a firm seal to prevent leaks. A screwdriver will help you adjust the clamp to tighten it properly.

Step 3: Connect the Drain Hose to the Sink Drain

Locate the inlet or the garbage disposal port on your double sink drain where the dishwasher drain hose will be connected. If your double sink has a garbage disposal, you will typically find a knockout plug on the side of the disposal unit.

Using a screwdriver and hammer, gently tap the knockout plug until it falls inside the disposal. Retrieve and discard the plug to ensure a clear path for the water.

Next, slide the dishwasher drain hose onto the garbage disposal port or the inlet of the sink drain. Slide a clamp over the drain hose’s end before attaching it to the port. Position the hose securely on the port and then slide the hose clamp into place, ensuring it covers the connection point.

Use a screwdriver to tighten the clamp firmly, ensuring the hose is securely fastened to prevent leaks.

Double-check the connection by gently tugging the hose to ensure it is properly secured.

Step 4: Secure the Drain Hose to the Underside of the Counter

To ensure that the drain hose remains in place and doesn’t sag or become dislodged over time, it is crucial to secure it to the underside of the counter or the cabinet.

Using a U-shaped Drain Hose

Using a U-shaped drain hose support clip or a metal bracket, fasten the drain hose at a high point to create an elevated loop. This loop prevents any potential backflow of dirty water from the sink to the dishwasher.

Position the clip or bracket at the highest possible point under the counter and secure it with screws or adhesive, depending on the type of support you are using. Thread the drain hose through the support, ensuring it is not twisted or kinked. This step helps maintain a steady and efficient water flow during the dishwasher’s drainage cycles.

Step 5: Connect the Dishwasher Drain Hose to the Air Gap (if applicable)

If your local plumbing code requires an air gap or if your double sink already has one installed, connecting it is the next essential step. The air gap is a small cylindrical fixture located on the sink or countertop that prevents dirty water from siphoning back into the dishwasher.

To connect the dishwasher drain hose to the air gap, remove the air gap cap and find the inlet corresponding to the dishwasher drain hose. Attach the end of the drain hose to this inlet, securing it with a hose clamp. Ensure the connection is tight and secure to prevent leaks.

Once secured, replace the cap on the air gap and proceed to the next step of the installation process. If your setup does not require an air gap, skip this step and move directly to final checks and power/water reconnections.

Step 6: Final Checks and Reconnect the Power and Water Supply

Double-check all connections before turning the power and water back on to ensure they are tight and leak-free. Inspect the drain hose for any kinks or bends that might impede water flow. Once satisfied with your checks, turn on the water supply valve under the sink.

Next, turn the circuit breaker back on to restore power to the dishwasher. Run the dishwasher for a short cycle and observe the drainage process. Check for leaks beneath the sink and around all connections. If any leaks are detected, tighten the hose clamps or connections as necessary.

Step 7: Test the Dishwasher

With the power and water supplies reconnected, it’s time to test the dishwasher to ensure it functions properly. Load a few dishes into the dishwasher and set it to a normal wash cycle.

Time to Test the Dishwasher

Observe the operation as it fills with water, washes, drains, and rinses. Pay close attention to the drainage process to ensure water is being expelled smoothly and there are no leaks at any of the connection points you worked on.

Step 8: Final Adjustments

After the test cycle is complete, check the area under the sink and the dishwasher for any signs of water leakage.

Ensure all connections remain secure and the drain hose is properly routed without twists or kinks. Make any necessary adjustments, such as tightening hose clamps or repositioning the hose for optimal drainage.

Step 9: Clean Up

Once you are confident that the dishwasher is functioning correctly and there are no leaks, clean up the work area. Remove any tools, discarded packaging, and any debris from the installation process. Ensure the area under your sink is dry and free of any leftover water.

Step 10: Enjoy Your Dishwasher

Your dishwasher installation is now complete, and you can enjoy the convenience of having your appliance properly connected and operational. To prevent any future issues, regularly check the hose connections and ensure they remain secure.

Enjoy the ease and efficiency that your dishwasher brings to your kitchen routine.

By following these simple steps, you can successfully install a dishwasher to your double sink without the need for professional help.

5 Things You Should Avoid

Disregarding Local Plumbing Codes
  1. Ignoring Local Plumbing Codes: One of the biggest mistakes you can make is disregarding local plumbing codes and regulations. These codes are in place to ensure safety and proper installation.
  2. Using Inferior Quality Parts: Trying to save money by purchasing lower quality parts can result in a faulty installation that may lead to leaks or more expensive fixes down the line. Invest in quality hose clamps, drain hoses, and fittings to ensure a durable connection that will last.
  3. Not Creating a High Loop: Failing to create a high loop with the drain hose can lead to dirty water being siphoned back into the dishwasher. This is a crucial step for preventing backflow and ensuring the proper operation of your dishwasher.
  4. Overtightening Fixings: While ensuring hose clamps and connections are secure is important, overtightening them can damage the hose or fittings, leading to leaks. Tighten until secure without applying excessive force.
  5. Skipping Leak Checks: After completing the installation, checking for leaks is essential. Running a test cycle without inspecting all connections can allow minor drips to escalate into significant issues.

Avoiding these common mistakes can ensure a successful and leak-free dishwasher installation.


How to install dishwasher drain to double sink might seem daunting, but following a systematic approach can make the process straightforward and manageable.

You can achieve a reliable and efficient installation by adhering to local plumbing codes, utilizing quality materials, and ensuring all connections are secure and leak-free.

Key steps such as creating a high loop and thoroughly testing the dishwasher post-installation are essential in preventing common issues like backflow and leaks.

Avoiding common pitfalls, such as ignoring local regulations or skipping essential steps, can save you from future headaches and potential damage.

By taking the time to carefully follow each outlined step and conduct thorough checks, you can confidently enjoy the convenience and efficiency a well-installed dishwasher brings to your kitchen.

Regular maintenance and checks will ensure your appliance’s longevity and optimal performance, making your investment worthwhile.

Leave a Comment