Inclub: 1PCS 1/2" G male vent valve. 1PCS 1/2" G female to 1/2" NPT male connector. Material: Solid brass. High strength, High temperature resistance, with certain anti freezing and anti impact capabilities The exhaust valve features a unique structural design that guarantees no water discharge during venting. As long as there is pressure in the system, the exhaust valve will continue venting. Primarily employed in heating systems, solar water heaters, underfloor heating manifolds, heating accessories, and more. Brass 1/2" NPT Male Air Vent Valve Automatic Float Valve Air Release Air Bleeder Valve