MATCO PXRT040304LF 3/4X1/2X3/4 LF T

An EX Barb (Expansion Barb) is a specialized fitting end used in PEX-A cold expansion systems (ASTM- F1960). It is designed to work with expansion rings and an expansion tool to create a strong, permanent, and leak-resistant connection between PEX tubing and fittings.