• PEX units increase during freezing and resist injury where by copper and CPVC techniques will burst, producing Many dollars in problems. Copper crimping: One of the most popular ways of connecting PEX is with copper crimping rings (view on Amazon), which involves using a Particular PEX crimping tool (watch https://daltonubhnt.bmswiki.com/5045747/the_ultimate_guide_to_whole_house_repipe