3/4" Expansion Brass PEX-A Barb MNPT Male Adapter is simple to install. Used to transition from a Female Nomial Pipe Thread to 3/4" Expansion PEX Pipe. 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 Expansion PEX fittings must be secured into place with Apollo Expansion PEX sleeves or comparable expansion-type sleeve or ring (all sold separately). The Apollo Expansion PEX 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.