copper vs pvc compressor lines?

lowbudget said

I could see running 3/4" if I would be using 2 - 3 outlets at once, but being a one man operation I can't justify the additional cost.

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having been a plumber for 42+ yesrs, I`m not the least afraid of sch. 80 pvc as a floating system---been in forso many yrs, I can`t remember-----bob