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when I took a class the inspector said pex could only be used if using a homerun system,i am talking about domestic water.Now all I see is pex with fittings cut in similar to a copper install.When you look at the inside of a 3/4 pex 90 it is similar to a 1/2 copper fitting.Is there a significant pressure drop if you dont use a homerun.I would rather use copper but its getting harder to compete with pex prices.Thanks