WW,

You bring up a good point. I wonder how you should indicate or warn for such as a fuel line. If it the dedicated type material that does to the trained person. But galvanized pipe can be used for water, air or gases. Also black pipe is used for air and gases. I think either is fine by code but either way know both are done with the metal pipe.

I don't think the rigid copper is used for anything other than water but copper tubing is used for propane and natural gas and water lines in slabs.

A QUICK WARNING. It is not normal in my part of the world but in some areas the water lines were used for an electric ground connection. If you break the metal pipe with PVC you need to take care of the ground circuit.

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