Description
When you need to isolate a hot water supply quickly and confidently, the colour of the handle matters. The KeyPlumb 15mm Hot Water Butterfly Ball Valve features a red handle — the universally recognised identifier for hot water lines — so there’s never any ambiguity during installation, maintenance, or an emergency shut-off. A single quarter-turn is all it takes to go from fully open to fully closed. WRAS approved and BS EN331 compliant, this is a valve you can fit and forget.
Available in packs of 1, 2, or 5 — ideal whether you’re doing a single tap replacement or fitting out a full bathroom or kitchen.
Key Features
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WRAS Approved — meets UK Water Regulations Advisory Scheme requirements; suitable for use on mains water supplies
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BS EN331 Compliant — manufactured to the European standard for ball valves for gas and other fluids
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Red Handle — universally recognised hot water identification; eliminates confusion between hot and cold supplies
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Full Bore Design — unrestricted flow path maintains system pressure and flow rate
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Quarter-Turn Operation — fast, positive open/close action; handle position gives instant visual confirmation of valve state
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Nickel-Plated Brass Body — corrosion-resistant construction for long-term reliability in hot water systems
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15mm Compression Fitting — compatible with standard UK 15mm copper and plastic pipe systems
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PN25 Rated — working pressure up to 25 bar; suitable for all standard domestic and commercial plumbing applications
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Temperature Range −10°C to +85°C — suitable for hot and cold water systems
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Available in Packs of 1, 2 or 5 — buy the quantity you need at a better per-unit price
Technical Specification
| Size |
15mm |
| Connection Type |
Compression |
| Valve Type |
Butterfly Ball Valve |
| Bore |
Full Bore |
| Operation |
Quarter-Turn Lever |
| Handle Colour |
Red (Hot Water) |
| Body Material |
Nickel-Plated Brass |
| Working Pressure |
PN25 (25 bar) |
| Temperature Range |
−10°C to +85°C |
| Approvals |
WRAS Approved, BS EN331 |
| SKU (x1) |
K55581 |
| SKU (x2) |
K55581*2 |
| SKU (x5) |
K55581*5 |
| Brand |
KeyPlumb |
Complete Your Valve Range
Frequently Asked Questions
What is the difference between the red and blue handle versions?
The red handle version (this product) is for hot water lines; the blue handle version is for cold water lines. Both are identical in specification — the colour coding is a standard plumbing convention to prevent confusion during installation and maintenance.
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.
Is this valve suitable for mains pressure systems?
Yes — the valve is rated to PN25 (25 bar working pressure), which is well above typical UK mains pressure. It is WRAS approved for use on mains water supplies.
Does this work with plastic (push-fit) pipe as well as copper?
This valve uses a standard 15mm compression fitting. It is compatible with 15mm copper pipe. For use with plastic pipe, ensure you use the appropriate insert/liner within the compression fitting. If in doubt, contact us for advice.
Why buy a pack of 5?
The pack of 5 offers a better per-unit price and is ideal for trade use, full bathroom or kitchen fits, or keeping spares on hand. The per-valve cost reduces significantly at the 5-pack quantity.
Is professional installation required?
While this valve is straightforward to install for a competent DIYer, we recommend professional installation to ensure compliance with building regulations and to maintain any relevant warranties on connected appliances.
