The Apollo ExpansionPEX 3/4 in. Brass PEX-A Barb x 3/4 in. Female Pipe Thread Adapter 90 Drop-Ear Elbow is simple to install and is designed for the installation of tub and shower outlets in most applications. Apollo ExpansionPEX barb fittings are a key component to one of the most economical potable water piping systems. Also capable of integration into hydronic heating systems, Apollo ExpansionPEX couplings must be secured into place Apollo ExpansionPEX sleeves or comparable expansion-type sleeve or ring (all sold separately). The Apollo ExpansionPEX system is a comprehensive piping system comprised of lead free brass fittings, poly alloy fittings, manifolds, valves, fasteners, tools and tubing designed for implementation in water delivery systems, simple or complex. A cold-expansion tool (sold separately) is required for installation. Features: Individually bagged Larger internal diameter of Apollo ExpansionPEX fittings results in a 25% greater flow rate within the system Pre-drilled backplate allows fitting to be secured to structure Constructed of lead free dezincification resistant (DZR) brass for superior reliability and strength Cold-expansion tool (sold separately) is required for installation Meets or exceeds ASTM F1960 standard Meets UPC, IPC and cUPC standard Must secured in place using Apollo ExpansionPEX sleeves or other PEX-A expansion sleeves/rings NSF listed Barb x FNPT connection for PEX-A plumbing systems Go/no-go gauges are never required To ensure secure connections every time, fittings cannot be dry fit Rated to 200 degree F and 200 psi Item is not compatible with PEXb pipe, crimp-style (ASTM 1807) or pinch clamp (ASTM F2098) piping systems