The Apollo PEX 1 in. x 3/4 in. x 3/4 in. plastic PEX barb tee (5 pack) is simple to install. Apollo PEX barb fittings are a key component of the most economical potable water piping systems. Also capable of integration into hydronic heating systems, Apollo PEX tees can be secured into place using copper crimps, stainless steel pinch clamps, or stainless steel crimp sleeves (all sold separately). The Apollo PEX system is a comprehensive piping system comprised of brass fittings, poly alloy fittings, manifolds, valves, fasteners, tools, and tubing designed for implementation in water delivery systems, simple or complex.