Eric Aune, a licensed master plumber in Minnesota, breaks down the differences between PEX-A, PEX-B, and PEX-C. He explains that the letters describe how the tubing is manufactured, not its quality. PEX-A uses an expansion fitting system with a power expander, which keeps the flow path wide and works well when flow rates matter. PEX-B uses press fittings, which are more universal and can also join PEX-A. Eric notes that most residential plumbing sees no real performance difference between the two. He also covers cold-weather installation, tooling costs, supplier support, and why mixing manufacturers can affect warranty coverage.

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