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Originally Posted by amesmich
2013 our team used copper tube from the compressor to reduce the chance of heat affecting the vinyl tubing. After the first 6 inches or 1st fitting we used the vinyl.
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R78 E covered tubing
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R78 E. Additional pneumatic tubing, with a maximum 0.160 in. inside diameter, functionally equivalent to that provided in the KOP,
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ID would have to be less than .16" (standard 1/4 OD copper is .19). Up to interpretation rather or not copper is functionally equivalent to plastic. I agree that it is completely safe. Rule compliant is debatable. That is what LRIs are for.
