Stopcock

Gain essential knowledge about stopcocks, the valves that control your home's water supply. This article guides you through their function, location, and the crucial role they play in emergencies and maintenance. As well as equipping you with the know-how to locate and operate your stopcock

What is a Stopcock?

A stopcock is a valve that controls the flow of mains water into a property. It allows you to turn the incoming water supply on or off. Stopcocks are essential features of any building’s plumbing system

Some key points about stopcocks:

  • They are installed at strategic points along the water supply pipes, often where the mains water first enters the property.
  • There is usually a main stopcock that shuts off all water to the property located where the water service pipe enters the building. This allows the entire water supply to be shut off for maintenance.
  • Smaller isolating stopcocks may be fitted on branches leading to things like sinks, toilets, washing machines etc. This allows water to these appliances to be shut off independently.
  • The stopcocks are usually metal (brass) valves with a tap-like handle to turn water flow on or off. Turning the handle at right angles to the pipe stops flow.
  • They are often located in accessible boxes near where the pipework runs for easy access. The main stopcock will be near the boundary of the property.
  • Stopcocks require periodic maintenance to keep them working properly and prevent seizing up. They need to be fully opened and closed to exercise the valve.
  • In an emergency like a burst pipe, the stopcocks can be closed to stop excessive water damage until the leak is repaired. They are an important isolation tool for plumbing maintenance and repair jobs.

How to find out where the stopcock is?

When viewing a new home, ask the owner where the main stopcock is located. It’s usually where the mains water enters the property. Look for a small metal valve with a handle on one of the incoming pipes.

If you can’t find it, look for a small access box near the front boundary of the house as stopcocks are often located outside. Failing that, contact a plumber to help locate it. Make sure you can turn it on and off before completing your purchase.

Knowing where your stopcock is and how to use it is invaluable knowledge for any new homeowner. It could prevent extensive damage and gives you control over your water supply.

Knowing you have control over your property’s water supply is reassuring. You can shut it off when going away on holiday too.

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