How to Install Waste Pipe for Washing Machine? (Step-by-Step)

Most people know that a washing machine has a water inlet and outlet pipe.

However, there is also a third pipe which is known as a waste pipe.

In this article, we’ll take a closer look at what waste pipe does and how to install them.

Here’s a quick sneak peek of what this article covers.

What is a waste pipe in a washing machine?

A waste pipe in a washing machine refers to a pipe that drains the dirty water and sewage from the machine.

It is usually located at the back of the washer, near the floor, and is usually made of metals and PVC or other plastic material.

The waste pipe is connected to the washer’s drainage system and leads to the sewer or septic tank. 

These waste pipes can either be fixed directly to the washer or through an extension from the outer ends of the drain lines.

Usually, the waste pipe runs under the house, but it can also be installed outside if there is an easy way to connect it to the sewer line.

What are waste pipe extensions in a washer?

Washing machine waste pipe extensions are used to either replace or extend the drain hose, which connects to a washer for draining the wastewater to a standpipe or a sewer.

Drain hoses are usually equipped with your washer and due to prolonged usage, they may need a replacement in the event of damage OR wear out. They may need an extension to reach a sewer or septic tank.

How to Install Waste Pipe for Washing Machine?

Washing machine waste pipe installation is a simple and straightforward process.

Follow the below steps to install a waste pipe for the washing machine.

Step 1: Turn Off the Washer and Locate the Drain Line

The first step is to turn off the power to the washer and wait five minutes for the liquid and gas lines to cool down. 

Next, Locate the washing machine drain line.

This can be found on the exterior of the machine, or beneath the kitchen sink.

Step 2: Disconnect all the connections and Inspect Drainage System

The next step is to disconnect all the connectors on both sides of the washing machine drain pipe.

Inspect the existing drainage system for any obstructions or leaks.

If necessary, remove any debris or obstructions from the pipe.

Step 3: Cut a section of drainpipe

Cut a section of drainpipe using a hacksaw or an electric saw.

Be sure to use a masonry bit if possible to avoid damaging your pipes.

Remove any protruding objects from the drain line, this includes washer drum mounts, hose clamps, and other hardware.

Step 4: Scoop a trench

Scoop a trench around the desired location and install a drainage pipe using cement or plastic pipe fittings.

Step 5: Connect the Waste Pipe

Now simply connect one end of the waste pipe to the existing drainage system outlet using available connectors e.g. garden hoses.

And attach the other end of the drainpipe to a suitable disposal system such as a septic tank.

The waste pipe’s connection to the washer can be done either by extending the existing drain hose, or you may detach the existing short-length drain hose completely, and connect the waste pipe directly to the washer.

Step 6: Make sure fittings are properly installed and secured

Make sure to implement all the fittings and supplies back to the washer, and turn on the power to the washer.

How to clean a waste pipe in a washing machine?

If your washing machine emits an unpleasant smell, or if it starts making strange gurgling noises, it may be time to clean the waste pipe that carries water and suds from the machine to the sink.

Follow the below steps to clean a waste pipe step-by-step.

  • First, unplug the washing machine. If you have a water shut-off valve near the washing machine, turn it off so that the water can’t flow while you work.
  • Next, locate the waste pipe that runs from under the machine to a nearby drain. It’s usually enclosed by a metal shield or cover and may have several bolts holding it in place.
  • Remove these bolts and lift off the cover.
  • Now you’ll see the waste pipe itself, which is made of either plastic or metal tubes and has a series of openings at one end for water and suds to escape.
  • The opening that is nearest to the machine is usually clogged with lint and other debris, so first take a stiff brush and scrub it clean.
  • Pour about two cups of hot water into the washing machine tub, add ½ cup of white vinegar (or bleach), and turn on the machine.
  • As the mixture bubbles, use a plunger to suction onto any debris that’s stuck in the pipe.
  • Once the suds have stopped flowing, use a hose to rinse the waste pipe clean.
  • Reattach the cover and bolts, and plug the washing machine in.

Repeat these steps if necessary, until the waste pipe is free of debris.

Note: You can even use hot water to clean a washing machine’s waste pipe, but be sure to read the manufacturer’s instructions first.

What are the advantages of washing machine waste pipes?

There are various benefits to having a waste pipe installed in your washers. 

  • A waste pipe allows water and detergent to be discharged without entering the machine’s main tub or exposing you and your clothes to potentially harmful chemicals and bacteria. 
  • Furthermore, a waste pipe can help reduce the noise level in your washer as water is running through it instead of being forced through the pump. 
  • Finally, a waste pipe can also help prolong the life of your machine by preventing the buildup of residues in the tub and by allowing wastewater to be drained from the machine more efficiently.

What are the drawbacks of a waste pipe in the Washer?

With lots of positive points and advantages, there exists a downside too.

Here are some of the disadvantages of installing a waste pipe in your washer.

  • It can be difficult to find and/or access the waste pipe during installation. If the pipe is hidden behind your washing machine cabinet or in a tight space, it can be tough to get to.
  • The waste pipe may become clogged over time, leading to reduced water flow and potentially serious cleaning problems.
  • If the pipe isn’t properly cleaned or maintained, it can also lead to leaks and even flooding.
  • The waste pipe may interfere with your machine’s ability to operate effectively. If it’s positioned too close to the spinning drum or other parts of the machine, it can create interference and drag, thereby hindering their performance.
  • By installing a waste pipe all by yourself, you’re likely increasing the chances of making mistakes during installation and subsequently causing further damage to your machine.

Professionals who are familiar with these setups should be consulted as they are often more knowledgeable and experienced.

Final Thoughts

A waste pipe in a washing machine is a necessary component that helps to drain the used water out of the machine and into your home’s sewer system.

While your washing machine may work just about perfectly even without a waste pipe, it is still important to install it if you want the wastewater to flow into the sewer system.

So, it is not mandatory to install the waste pipe, it’s just that it helps you to get rid of the water more efficiently.

Without a waste pipe, your washing machine would be unable to function properly.

If you are having issues with your waste pipe, it is important to contact a professional plumber to have it repaired or replaced as soon as possible.

Frequently Asked Questions

Here are some commonly asked questions about waste pipes that may be of help to you.

Do all washer waste pipes work the same way?

Most washing machine waste pipes work in a similar way, but there may be some subtle differences between models. Check your washer’s manual for specific instructions.

How long can a waste pipe be in a washing machine?

Typically, the length of a waste pipe can be as long as 10 feet or more. It is recommended to install a waste pipe with shorter lengths that run between your washer and the sewer line. The overall length may completely depend on the size and setup of your washer.

What is the most common problem with a waste pipe?

If your washing machine’s waste pipe is blocked, it can cause all sorts of problems. The most common problem is that the machine won’t drain properly, and water will start to build up in the tub. This further leads to multiple issues, including clothes not getting clean and the machine becoming unbalanced and shaking.

What do I do if the washer’s waste pipe is blocked?

There are a few things you can do to try and clear a blocked waste pipe. First, try running some hot water through the pipe to break up any clogs. If that doesn’t work, you can try using a plunger or a plumber’s snake to clear the blockage. If all fails, you may need to call a plumber to come and take a look.

Is there any warranty on the washing machine waste pipe?

Washing machine manufacturers usually do not offer any warranty coverage for waste pipes. You may check with the seller about the same.

Where does the waste pipe for a washing machine go?

One end of the waste pipe goes through the wall of your house to enter the sewage system, whereas the other end connects to the washer’s drain outlet.

Manish Singh is an expert in electrical engineering with a Diploma in the field. With over 12 years of experience, he specializes in repairing music systems, washing machines, dryers, and other laundry-related appliances. His in-depth knowledge in electrical repairs and decent knowledge about garment care makes him a trusted authority in the field of appliance repair and laundry related topics. If you have any questions or need assistance with your appliances, you can reach out to Manish through email: manish.singh (at)