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Homeowner Guide
Valves & Stopcocks
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The Main Stopcock
The single most important thing to find in your home before you need it
⭐ Essential›
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Isolation Valves
The small valves under every sink, toilet, and appliance — and why they matter
⭐ Essential›
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Gate Valves
The older wheel-handled valves often found near tanks and cylinders
✅ Helpful›
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Thermostatic Radiator Valves (TRVs)
The valves on your radiators — and how to stop them seizing
⭐ Essential›
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The Lockshield Valve
The capped valve on the other side of your radiator
✅ Helpful›
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Ball Valves & Float Valves
The valve inside your toilet cistern and loft tank
✅ Helpful›
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Pressure Relief Valve (PRV)
Your boiler's critical safety valve — what it does and when to be concerned
✅ Helpful›
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The Filling Loop
How to repressurise your boiler yourself — the right way
⭐ Essential›
Got a specific question?Diagnose your problem or browse our fix guides.