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secret squirrel

I have replaced my own stopcock and a radiator, next to the feed and return is a 22mm copper pipe, this is not the mains into the house.

I am presuming it is a gas feed to the boiler, the pipe is not marked up as gas anywhere that I can see and is not insulated.

My question is two fold:

1. should it be marked (presuming yes, the ones I've seen are marked gas in yellow tape)

2. should it be insulated?

and how can I be sure its gas without cutting it (joke)

I am not gas qualified...

thanks
 
1.No it doesn't need to be marked
2.No it doesn't need insulating
Tip and you'll thank me for this one day if you have 3 pipes running behind a unit for example,you know 1 is hot & cold and the other is gas,get your blowlamp on each one for lets say 10 seconds.The 2 water pipes will cool very quickly,due to fluids in the pipe dissipating heat,the 1 that stays hot for longest is the gas pipe,try it :rolleyes:
 
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