How to Install a Washing Machine drain hose

Actually plumbing in a washing machine comes under plumbing. So it’s not a topic covered by Whitegoodshelp. The drain hose should be fitted according to the washing machine’s manual. If you don’t have the instruction manual you might be able to download one here – instruction manuals for white goods appliances.

Having said that, this page offers additional advice not covered by the manuals.


Kitchen sink

At the most basic level a drain hose can be hooked over a sink. This requires no plumbing in. However, it’s not ideal at all. If something (eg. a dish cloth) fell into the sink, or if a washing up bowl was left in, then the sink hole could get blocked.

This would result in the water flooding over the top of the sink. Also if the drain hose somehow fell off the sink you would have a serious flood. If left unattended the washing machine would continue to fill trying to make up the lost water. It would never stop filling and flooding until stopped.

So clearly a drain hose needs to be attached properly and permanently into the plumbing.

Drain hose

Drain hose
Washing machine drain hoses have traditionally been pushed into a standpipe, which was just a grey or white plastic tube that went through the outside wall and pointed into an open grate.

But this method has fallen out of fashion. Most washing machines are now plumbed into a u-bend under a sink. Plumbing into the u-bend is considerably easier and cheaper.

The drain hose now pushes onto a spigot, which in turn screws onto the u-bend. The spigot is usually tapered. If you push the drain hose onto it as firmly as possible it should fit quite snugly.

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Plumbing the drain hose properly

Drain hose connection at sink After making sure that the drain also securely fixed to the plastic spigot you can screw the spigot onto the U bend. Make sure you don’t cross thread, which is easily done with plastic threads. The most important thing to ensure now is that there is not a direct run from this drain hose down into your washing machine.

Ideally you should try to make sure that the drain hose goes up from the spigot at least three or 4 inches before descending down to the washing machine. It may need tying up.

This is because if there is a direct run down from the drain hose you can get water from the sink running down into the washing machine. This can cause water to build up in the drum.

Drain hose not long enough?

Drain hose extended

The drain hose on a new washing machine is quite short. It’s only long enough to fit right in front of the waste water pipe, or right next to the sink if plumbed into a u-bend. This is fine for most people.

But many people need to install their washing machine further away. So the drain hose is way too short. So if your drain hose is too short you can either replace it with a longer one (typically 2 or 2.5 m) or you could extend the current one using a drain hose extension kit. Try my affiliate Ransom Spares for drain hoses and extensions.

This is the second article on installing a washing machine. If you haven’t seen the first part which looked at the basics and then concentrated on fill hose related advice check it out here – How to install a washing machine. This article just looks at how to install the drain hose.

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24 thoughts on “How to Install a Washing Machine drain hose”

  1. Hi Andy,
    We have a Bosch WAE24166/GB which due to kitchen renovation has ended up further from the drain and will require an extension. I am a little dubious about joined hoses so am looking at a 3.5M hose. However that particular hose includes a warning about checking outlet sizes [22/29mm] before buying which I am unable to do at the moment. Could you please advise if these sizes are compatible with my Bosch water pump..

  2. Andy Trigg (Whitegoodshelp)

    Hello Anthony, as far as I’m aware the sizes are to do with fitting on u-bend plumbing under the sink. They should fit all pumps. If your drain hose slots into an old style stand pipe you can ignore the measurements. If it pushes onto a tapered connector (spigot) under the sink the size might be significant although if tapered it will hopefully fit. The scenario you don’t want is where the rubber on the end of the drain hose is too wide to snugly fit. Even then though, yu may well be able to cut off the rubber section and push the actual plastic drain hose onto ta tapered spigot. However, you may need to use plumbers tape and/or a jubilee clip to make it watertight. There are a variety of different universal drain hoses here of varying lengths washing machine hoses including drain hoses

  3. I have just been given a washing machine the waste hose is short about one to two inches can this be fixed and washing machine used if an extension is put on the small hose I have

    1. Andy Trigg (Whitegoodshelp)

      Hi Ann. Yes. It’s covered in my article above with links to buy the parts needed. Either use a drain hose extension kit, or just replace the old hose with a long drain hose.

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