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The gas people have now been out. It's a MEDIUM PRESSURE REGULATOR. The gas pipe that comes into our road is medium pressure, which is far too strong for domestic use, so the pressure regulator converts it to low pressure. I now realise it's an important part of the gas supply, and is not...

Hey I have got a box exactly same as yours, J125-S5 (except the lift-off cover is metal and it's not in bad condition). I am wondering what it is for. I never had one at my previous address. The builder who is doing a small extension for me says he THINKS it is something to do with gas...