Identifying a gas pipe

6 May 2010
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United Kingdom
I have an external 1/2 inch copper pipe going up the wall of my house. It emerges from just above ground level and re-enters at the first floor height. It's probably a water pipe but how can I be sure that's it not an old capped off gas pipe before cutting into it?
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more likely to be gas...feeding a fire upstairs ?

water normally is kept inside the it does not freeze
If it is sleeved it is much more likely to be gas.

It is not a legal requirement to identify gas pipes in domestic installations, so there will not be anything to look for other than the destination or source of the pipe.

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