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Running 1/2" PEX through a 3/4" PEX chase

SciencemanScienceman Member Posts: 1
I used Watts 3/4" radiant PEX between the 2nd floor and the basement in a 200+ year old house as a chase for 1/2" Wisbro hePEX. Will this be a problem as a result of differential rates of expansion? I did not want the Wisbro PEX to be abraded as it was fed through this chase to and from the header.


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