A straightforward 15mm straight washing machine valve for controlling water supply to your washing machine. Simple quarter-turn operation, standard 15mm compression fitting, and a no-nonsense design that gets the job done.
A washing machine valve is one of those fittings you don’t think about until you need one in a hurry. This 15mm straight valve gives you a reliable isolation point on the water supply to your washing machine, letting you shut off flow without turning off the whole system. It fits standard 15mm copper pipe and installs with a compression fitting, so no specialist tools required.
The straight configuration suits installations where the pipework runs directly inline with the appliance hose connection. That covers the majority of under-counter washing machine setups where the feed pipe comes through the back of the cabinet or straight out of the wall behind the machine. Quarter-turn operation means it’s quick to use and easy to tell at a glance whether it’s open or closed.
Where This Washing Machine Valve Gets Used
Plumbers fitting out kitchens and utility rooms reach for these constantly. New build, refurb, straight swap on a leaking or seized existing valve — this covers the lot. Having a handful in the van means you’re not making a second trip to the merchant for something that should have been standard stock. At this price, there’s no reason not to.
These are also a sensible upgrade on older properties where the original valves have corroded or stiffened up to the point where they’re more ornamental than functional. Swapping one out is a twenty-minute job on a good day. Fit a new washing machine valve while the supply’s already isolated and your customer won’t need to call you back when it eventually gives up.
Compatible with standard washing machine inlet hoses and 15mm copper pipe throughout.
Pro Tip: Before fitting, wrap PTFE tape around the compression olive seat threads and check the olive is seated squarely — a slightly cocked olive is the most common cause of a weeping joint on compression fittings.
Used when installing or replacing washing machines in domestic kitchens, utility rooms and laundries. Also common in commercial laundry setups where individual machine isolation is needed for servicing. Suitable for new installations and direct replacement of failed or corroded valves on existing 15mm copper pipework runs.
Best For
Washing machine water supply isolation
New kitchen and utility room installations
Replacement of seized or corroded valves
Domestic and light commercial laundry setups
Compatible With
15mm copper pipe
Standard washing machine inlet hoses
Compression fittings
Key Features
Straight configuration
15mm compression connection
Quarter-turn operation
Inline flow path for direct pipework runs
Not suitable for: Not suitable for 22mm pipework or push-fit systems without an appropriate adaptor. Not intended for hot water supply lines unless the valve is specifically rated for it.
Isolate the water supply before starting. Cut the pipe cleanly and deburr the end so the olive seats properly. Slide on the cap nut and olive, push the pipe fully into the valve body, and tighten the cap nut to compress the olive against the fitting. Avoid overtightening — firm hand pressure plus about a quarter turn with a spanner is typically enough.
Once fitted, open the valve and check for any weeping at the joint before reconnecting the appliance hose. A slow drip at the compression point usually means the olive hasn't seated correctly, so back off the nut slightly, reposition, and retighten rather than just cranking it harder.
Isolate the mains water supply before cutting into the pipework
Cut the 15mm pipe cleanly and remove any burrs with a deburring tool or file
Slide the cap nut then the olive onto the pipe end, ensuring both face the correct direction
Insert the pipe fully into the valve body until it bottoms out
Hand-tighten the cap nut, then use a spanner to turn a further quarter turn to compress the olive
Open the valve and restore the water supply, checking the joint carefully for any weeping
Connect the washing machine inlet hose to the valve outlet and turn on
Will this valve fit straight onto 15mm copper pipe without any adaptors?
Yes, it uses a standard 15mm compression fitting that connects directly to copper pipe. No adaptors needed for a copper pipe installation.
What is the difference between a straight and an angled washing machine valve?
A straight valve keeps the flow path inline, which works well when the pipe runs directly behind or below the machine. An angled valve redirects the flow at 90 degrees, useful when the pipe comes out of the wall at a right angle to where the hose needs to connect. Choose based on your pipework layout.
Can I use this valve on a hot water supply as well as cold?
Washing machines are almost always connected to the cold supply only, so this is the typical use case. If you need to use it on a hot feed, confirm the temperature rating of the valve before fitting as standard isolation valves vary in their heat tolerance.
A quarter-turn isolation valve with a straight flow path and 15mm compression connections. Constructed to suit standard domestic plumbing installations. The compression fitting design provides a reliable seal without soldering, and the quarter-turn mechanism gives clear open and closed positions. Suitable for cold water supply lines to washing machines and similar appliances.
Connection Type
Compression
Pipe Size
15mm
Configuration
Straight
Operation
Quarter-turn
Typical Application
Washing machine cold water supply isolation
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