Are washing machine drain hoses a standard size?

Author: Prof. Armando Thompson III  |  Last update: Wednesday, November 12, 2025

The standard washing machine drain size is 2 inches, and the minimum requirement is 1 1/2 inches. Modern washers typically require a larger drain, and you may need a larger drain if it's connected to your kitchen sink. Standpipes should be between 18 and 30 inches from the floor.

Are all washing machine drain hoses the same size?

Washing machine hoses can vary in terms of length, shape, and material. Some hoses have straight ends, while others have a 90-degree elbow on one end so that the hose fits snugly against your laundry room wall. But they have one thing in common: they all sport ¾-inch female threaded fittings on both ends.

What is the standard diameter of a washing machine drain hose?

The drain pipe should be a minimum of 1-1/2" I.D. (inside diameter) to ensure proper draining. The Washer drain hose is a 1-1/4" O.D. (outside diameter). To be confident that no siphoning of water will take place, the drain plumbing must be a minimum of 30" high for Top Load Washers.

What size are washing machine hoses?

Most washing machine hoses use standard ¾-inch fittings, but you can choose between straight ends or a 90° elbow design.

Are all hoses standard size?

Size and Flow Rates

Hose diameters range from 3/8-inch, 1/2-inch to 3/4-inch. In the United States, most standard garden hoses are 5/8-inch in diameter. The bigger the diameter, the more water is delivered. The bigger the diameter determines how much hose can be put on any of our water hose storage products.

Universal Drain Hoses for Washing Machines and Dishwashers

Are all washing machine hookups the same?

Are all washer dryer hookups the same? No. Some have a single handle to allow the water to flow into the washing machine; some will have two separate handles on the valves. But in both cases they should accommodate standard hoses.

What size drain pipe is needed for a washing machine?

Answer: The minimum 2-inch drainage pipe is used for the standpipe, trap, trap arm to the vertical vent or waste stack and also for the vertical vent. As soon as the drainage pipe turns horizontal from the vertical vent or waste stack, the minimum drain pipe size for the horizontal drain is to be 3 inches.

Can you replace washing machine drain pipe?

If your washing machine drain hose is leaking, split, torn or damaged, your washing machine won't be able to drain or function properly. As such, the drain hose will need to be replaced to get your appliance working properly again.

Are drain pipes universal?

Are sink drains universal? Kitchen sink drains have a universal diameter. It doesn't matter if you're using a double-basin sink, or a single-basin sink, the drain hole diameter is 3 and ½ inches. This is larger than a bathroom drain, and the same size as a standard bathroom drain.

Can a sink and washing machine share the same drain?

Yes, with a Y-fitting, you can successfully connect a utility sink and washing machine to the same drain.

What size is washing machine outlet hose?

This drainage hose features one end with a 26mm I.D. elbow, most commonly used at the appliance end to avoid hose kinking. The other end features a 21mm I.D. outlet.

How often should you replace a washing machine drain hose?

Regardless of their condition, washing machine hoses should be replaced about every 5 years to prevent a flooding emergency. Standard washing machine hoses are made of black rubber. Unfortunately, these hoses only last a few years and will eventually fail, causing one big mess and costly water damage.

Are all drains the same size?

There are three common drain sizes for bathroom sinks, 1.25", 1.5" and 1 5/8 (1.625"). You need to select a drain that is the same size or SMALLER than the hole in your sink.

Is it okay to extend a washing machine drain hose?

Ideally you should extend the plumbing to the appliance, for both water supply and drain waste. But if absolutely necessary you can extend your waste drain hose to a maximum of three (3) metres, providing the use of the correct bore size, type, and quality of hose, and suitable joining pieces are employed.

What is the washing machine drain pipe called?

A washing machine drain pipe, also known as a drain hose, is a flexible tube used to expel used water from a washing machine to a dedicated drain system. The washing machine drain pipe is an essential component of any household laundry system, ensuring efficient and safe removal of water post-wash.

What size are most washing machine drain hoses?

The standard washing machine drain size is 2 inches, and the minimum requirement is 1 1/2 inches. Modern washers typically require a larger drain, and you may need a larger drain if it's connected to your kitchen sink.

What diameter are washing machine hoses?

Washing Machine. Connectors, valves, hoses and fittings for plumbing in your washing machine or dishwasher. Washing machine and dishwasher inlet hose connections use a 3/4 inch BSP thread (measures about 1 inch with a ruler), see BSPT link at bottom of page for more information about British Standard Pipe Thread sizes.

Are all washing machine pipes the same size?

Drain hoses for domestic washing machines and dishwasher's are generally universal but the end fitting that connects to the machine sometimes differ. there are a number of differing “cuff” diameters (19mm and 22mm) but these can often be purchased separately and fitted to a length of hose.

What size is a washing machine hose connector?

The 3/4" NPT connections at both ends of the washer hose are compatible with all major Samsung/LG/Bosch/Siemens etc. washer and dryer brands.

Do new washers come with a drain hose?

Most washing machines come with the drain hose already attached to the back. It's usually a long, grey hose. Some machines also come with a U-shaped bracket. This is for hanging the drain hose up, which stops dirty water going back into the machine.

Can I plug a washing machine into a regular outlet?

While a washing machine will run on a normal outlet, your machine will be much safer and your laundry room more protected if you use a GFCI outlet. In new homes today, GFCI outlets are required to be installed in laundry rooms to help add safety and security to your home.

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