GN881-G1/2-200-MS-M Breather Valve Brass Brass, J.W. Winco, Mfr#: 881-G1/2-200-MS-M

Once the opening pressure given in the table is exceeded, GN 881 breather valves with gasket will vent into a container, preventing excessive internal container pressure. In its normal state, the gasket seals the container and prevents dirt and dust from getting inside of it.