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The use of PEX tubing in a potable hot water plumbing system with an operating temperature above 140 deg F or system pressure above 80 psig or highly aggressive water quality or any combination there of can significantly reduce the service life of the tubing.
HeatLink® 19028 Coupling, 1 in F2159 PEX x 1 in F2159 PEX, Polyphenylsulfone