UNION 1/2 NPT RH features industry preferred duo-flow design. The self-supported rotating union is composed of stainless-steel rotor, radial housing connection, 3 vent holes, forged brass housing, keyed rotor seal and balanced mechanical seal. The ball bearings are lubricated for life. The union supports operation in poor water quality (E.L.S.). The sealing components are quickly and easily replaceable (rotor seal, floating seal). The union also comes with special options of threaded vent holes, standard seal combinations and standard carbon graphite/silicon carbide materials. Silicon carbide material provides resistance in severe conditions (poor water quality)