I've used PEX a few times as a DIY homeowner. I recently came across a few videos that show installations where numerous fittings were used in PEX runs, which I believe is contrary to the great benefits (in terms of reducing installation time, reducing the potential for leaks, maintaining flow/pressure, and lowering cost) of PEX. Am I missing something, or are these installations showing sub-optimal use of PEX?
https://ecoinnovation.ca/drain-water-heat-recovery-resources/installation/
https://ecoinnovation.ca/drain-water-heat-recovery-resources/installation/
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