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PVC and/or CPVC piping materials are not suitable for compressed gas service due to their brittle fracture characteristics. Whereas it appears to be rated for the pressure, it is really a bad idea if it ever does fail. There are many, many warnings out there from both the pipe manufactures and legislative bodies on this. I have witnessed a couple of failures where somebody pressure tested PVC lines with compressed air and subsequently visited the hospital. The codes are out there for a reason.
There are ABS-based airline piping systems available, but tend to be spendy. Another alternative is to use polyethylene tubing and push-connect fittings (quite reasonable) available through McMaster-Carr and others.
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