Description
The valve behind the basin. The one under the sink. The one that lets you change a tap washer without turning off the water to the whole house. The KeyPlumb 15mm Straight Isolation Valve is a fundamental plumbing component — compact, chrome-plated, WRAS approved, and built to sit quietly in place for years until the moment it’s needed. A flathead screwdriver is all it takes to isolate any individual fixture. Available as a single valve or pack of 10 for trade use.
Key Features
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WRAS Approved — independently certified for use on mains potable water supplies; meets UK Water Supply (Water Fittings) Regulations
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Straight Pattern — inline configuration for direct pipe runs; ideal for basin, tap, and fixture isolation
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Screwdriver Slot Operation — quarter-turn flathead screwdriver; tamper-resistant and compact in tight spaces behind basins and under sinks
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Chrome-Plated Finish — corrosion-resistant, professional appearance; suits exposed installations
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CxC Compression Fittings — compression-to-compression connection both ends; compatible with standard 15mm copper and plastic pipe
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15mm Size — the standard domestic pipe size for basin, tap, toilet, and appliance supply lines
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Hot & Cold Water — suitable for all standard domestic hot and cold water supply applications
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Single or Pack of 10 — buy what you need; pack of 10 offers the best per-unit value for trade use
Technical Specification
| Size |
15mm |
| Pattern |
Straight (inline) |
| Connection Type |
Compression to Compression (CxC) |
| Operation |
Screwdriver Slot (quarter-turn) |
| Finish |
Chrome Plated |
| Application |
Hot & Cold Water, Basin, Tap & Fixture Isolation |
| Approvals |
WRAS Approved |
| SKU (Single) |
K06926 |
| SKU (x10) |
K06926 x10 |
| Alt. Part Numbers |
KPISO15 | 502CP |
| Brand |
KeyPlumb |
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Frequently Asked Questions
What is a straight isolation valve used for?
A straight isolation valve is fitted inline on a water supply pipe to allow a single fixture — such as a basin tap, toilet cistern, or kitchen tap — to be isolated for maintenance or replacement without turning off the water supply to the whole property. It’s one of the most commonly fitted plumbing components in domestic installations.
Can I order if the item shows as out of stock?
Yes — we can fulfil this product even when stock shows as zero. Place your order as normal and we’ll confirm lead time with you.
What is the difference between a straight and angled isolation valve?
A straight (inline) valve is used where the pipe runs directly to the fixture — the valve sits in the pipe run without changing direction. An angled valve (90°) is used where the pipe comes up from the floor or out from the wall and needs to turn before connecting to the fixture. Choose based on your pipe configuration.
How do I operate a screwdriver slot isolation valve?
Use a standard flathead screwdriver. When the slot is parallel to the pipe, the valve is open. When the slot is perpendicular (across) the pipe, the valve is closed. It’s a quarter-turn (90°) operation — fast and positive.
Does this work with plastic pipe as well as copper?
This valve uses standard CxC compression fittings, compatible with 15mm copper pipe. For plastic pipe, use the appropriate insert/liner within the compression fitting to prevent the olive from crushing the pipe wall.
Why buy the pack of 10?
At £1.05 per valve versus £1.20 individually, the pack of 10 saves 12.5% per valve — ideal for trade use, full bathroom or kitchen fits, or keeping a stock of spares. The compare-at price reflects the full single-unit cost across 10 valves.
