pe fitting wholesaler tells you how to use these two pipes.

The use of PVC pipe is common but NOT RECOMMENDED for use with compressed air. It is often used because it is readily available, inexpensive, and easy to install. However, as with many plastics, PVC gets brittle over time and can crack, break, or even shatter. The presence of air compressor oils in the line and heat from the compressed air accelerates the degradation of PVC. These failures, combined with air under pressure, are potentially fatal due to the airborne, razor-sharp shrapnel. It is also an OSHA violation to use PVC for compressed air distribution, which means you could incur a hefty fine.

Galvanized piping is commonly used for water distribution and for general plumbing. Galvanized coating resists moisture in compressed air but pieces of the coating will flake off and end up in your tools. The debris will cause severe damage to cylinders, pneumatic tools, and other components. Even more importantly, when exiting a blow gun, little flakes can cause serious bodily harm. Galvanized piping is NOT RECOMMENDED for compressed air systems.

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