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Mains pipe sleeving

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If putting in an instantaneous shower, the pipe has to go through an inside solid wall which is not exposed to any cold conditions!
Do I still have to sleeve it?
The pipe has been "Teed" off the mains from the tank feed and goes through a breezed block wall into the bathrooom..!
Don't thing I'll really have to worry about insulation..



:party:AGREE!!
 
It won't hurt to sleeve it
 
Internal walls I just tend to wrap some electric insulation tape around the bit in the wall.
 
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