Automatic and efficient bleeding of air from water heating and HVAC systems, maintaining stable system pressure. brass construction offers excellent resistance and long service life. Suitable for use in closed water heating circuits, HVAC systems, and other water-based installations. Improves heating efficiency and reduces noise caused . G1/2 external thread design allows quick and secure connection to most heating pipes, radiators, and manifolds; threaded joints a reliable seal when used with appropriate sealing materials., Weight: 0.2866009406 pounds, Manufacturer: Gishbjka