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Thank you very much for your reply which is very helpful.It is installed the wrong way round from a design & use point of view and will not shut the gas off as intended (in other words, it is fairly pointless).
That alone is enough reason to have it correctly installed. As it is it will probably isolate the fire but not without allowing a large amount of gas to escape whilst closing it down and replacing the top outer cap & washer in your case, to stop gas escaping. You would really need to turn the gas off (at the meter most likely) to be able to isolate the fire safely.
I suspect they put it in that way round because of its dimensions but they would have been better to alter the pipework. They could use a male iron to copper into the malleable elbow and copper to an angled gas isolation valve or an elbow and a straight valve.
Hope this helps!
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