The Apollo Expansion PEX Washing Machine Outlet Box includes 1/2 in. Brass PEX-A barb washing machine valves and is simple to install. It provides flow control through an anti-stick and smooth operating quarter-turn handle. Apollo Expansion PEX barb fittings are a key component of the most economical potable water piping systems. Apollo Expansion PEX barb connections must be secured into place 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.