Description
The workhorse of the isolation valve world. The KeyPlumb 15mm Full Bore Isolation Valve is the valve you fit and forget — tucked neatly behind a basin, under a sink, or inline on a supply pipe, ready to do its job when you need it. A screwdriver slot keeps it tamper-resistant and compact in tight spaces, while the full bore design ensures zero flow restriction when open. Chrome-plated brass construction, WRAS approval, and EN1254-2 compression fittings on both ends make this a specification-grade valve at a trade-friendly price. Available in packs of 1, 5, or 10.
Key Features
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WRAS Approved — independently tested and certified for use on mains potable water supplies; meets UK Water Supply (Water Fittings) Regulations
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Full Bore Design — unrestricted 15mm flow path when open; no pressure drop or flow restriction
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Screwdriver Slot Operation — quarter-turn flathead screwdriver operation; tamper-resistant and compact for tight spaces
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Chrome-Plated Brass Body — nickel-plated brass with chrome finish; corrosion-resistant and professional in appearance
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EN1254-2 Compression Fittings — standard compression connections both ends; compatible with 15mm copper and plastic pipe
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10 Bar Rated — maximum operating pressure well above typical UK mains (3–5 bar)
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Up to 95°C — suitable for hot and cold water systems and heating circuits
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Hot & Cold Water — suitable for all standard domestic plumbing and heating applications
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Available in Packs of 1, 5 or 10 — better per-unit value at higher quantities; ideal for trade use
Technical Specification
| Size |
15mm |
| Connection Type |
EN1254-2 Compression (both ends) |
| Valve Type |
Full Bore Isolation Valve |
| Operation |
Screwdriver Slot (quarter-turn) |
| Body Material |
Nickel-Plated Brass |
| Finish |
Chrome Plated |
| Max Working Pressure |
10 bar (145 psi) |
| Max Working Temperature |
95°C |
| Application |
Hot & Cold Water, Heating Systems |
| Approvals |
WRAS Approved, EN1254-2 |
| SKU (x1) |
K06922 |
| SKU (x5) |
K06922 x5 |
| SKU (x10) |
K06922 x10 |
| Alt. Part Numbers |
KPFBISO15 | 1003CP |
| Brand |
KeyPlumb |
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Frequently Asked Questions
What is the difference between a full bore and standard bore isolation valve?
A full bore valve maintains the same internal diameter as the connected pipework (15mm), so there is no restriction to flow when the valve is open. A standard bore valve has a reduced internal diameter which can restrict flow and cause a pressure drop. For applications where flow rate matters — showers, baths, washing machines — always choose full bore.
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.
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.
Is this valve suitable for heating systems?
Yes — the 95°C maximum temperature rating makes this valve suitable for heating system pipework, including radiator isolation and boiler connections, within standard domestic operating temperatures.
Does this work with plastic pipe as well as copper?
This valve uses EN1254-2 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 a pack of 10?
The pack of 10 offers the best per-unit price at £2.90 per valve versus £3.50 individually — a saving of 17% per valve. Ideal for trade use, full property fits, or keeping a stock of spares on the van.
