Description
Not all isolation valves are the same — and this one is specified for a reason. The KeyPlumb 15mm Flat Face Compression x ½" BSP Isolation Valve is the correct valve for installations where a basin mono tap with a flexi tail connects to a 15mm copper supply pipe. The flat face compression end grips the pipe without an olive, while the ½" male BSP thread connects directly to the flexi tail. A flathead screwdriver closes it off in a quarter-turn. Chrome-plated brass, neat, and built to last behind a basin pedestal for years.
Key Features
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Flat Face Compression Inlet — 15mm flat face compression fitting; connects to copper pipe without a traditional olive; provides a secure, leak-proof seal
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½" BSP Male Thread Outlet — standard ½" male BSP thread; connects directly to flexi tails on basin mono taps, kitchen taps, and similar fixtures
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Screwdriver Slot Operation — quarter-turn flathead screwdriver; tamper-resistant and compact for tight under-basin spaces
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Chrome-Plated Brass Body — corrosion-resistant construction with a polished chrome finish; professional appearance for exposed installations
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Isolates Individual Fixtures — allows a tap or fixture to be isolated for maintenance without shutting off the water supply to the whole property
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Hot & Cold Water — suitable for both hot and cold water supply lines
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1-Year Manufacturer’s Guarantee — backed by KeyPlumb warranty
When to Use This Valve
This valve is specifically designed for installations where:
- A basin mono tap (single lever, one tap hole) is being fitted with a flexi tail connection
- The supply pipe is 15mm copper and the tap tail is ½" BSP (the UK standard)
- A flat face compression fitting is required rather than a standard olive-and-nut compression
If your installation uses a standard CxC compression connection (no BSP thread), see our Straight Chrome Isolation Valve or Full Bore Isolation Valve instead.
Technical Specification
| Size |
15mm |
| Inlet Connection |
15mm Flat Face Compression |
| Outlet Connection |
½" BSP Male Thread |
| Operation |
Screwdriver Slot (quarter-turn) |
| Body Material |
Chrome-Plated Brass |
| Application |
Basin Mono Taps, Flexi Tail Connections, Hot & Cold Water |
| Guarantee |
1 Year |
| SKU |
K23853 |
| Alt. Part Numbers |
KPSTRFLA15 |
| Brand |
KeyPlumb |
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Frequently Asked Questions
What is a flat face compression fitting?
A flat face compression fitting connects to the pipe using a flat sealing face rather than a traditional olive (ferrule). The pipe end is inserted and the nut is tightened, compressing the flat face against the pipe to create a watertight seal. It is commonly used in isolation valves where a BSP thread outlet is also required, such as this valve for basin mono tap 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 this valve and a standard CxC isolation valve?
A standard CxC (compression-to-compression) isolation valve has compression fittings on both ends and is used to isolate a section of pipe. This valve has a flat face compression inlet on one end and a ½" BSP male thread on the other — making it specifically designed to connect a 15mm supply pipe directly to a flexi tail on a basin tap. If you don’t need a BSP thread outlet, use the straight CxC isolation valve instead.
Will this fit my basin mono tap flexi tail?
Yes — provided your flexi tail has a standard ½" BSP female connection (the UK standard for basin mono taps), this valve will connect directly. Check your tap’s flexi tail specification if unsure.
Is this valve WRAS approved?
This valve carries a 1-year manufacturer’s guarantee and is suitable for domestic hot and cold water supply. If you specifically require a WRAS-approved valve, please see our WRAS Approved Straight Isolation Valve or WRAS Approved Full Bore Isolation Valve.
Can this be used on a hot water supply?
Yes — this valve is suitable for both hot and cold water supply lines in standard domestic plumbing applications.
