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Aidan
 
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(Aidan) wrote in message om...
Use PEX pipe. Install in as 'pipe-in-pipe', i.e., Pex pipe in a corrugated sleeve.


PS Unless they are gas pipes in which case, of course, they have to be
metal and cannot be in an unvented void. In that case, use soldered
copper and wrap with Denso tape with a 50% overlap.