Available in metric sizes with stainless steel mesh of 100 or 500 µm, GN 7403 Aluminum Breather Strainers are mounted into wall of enclosures, ensuring pressure equilibrium between inside of enclosure and outside. Outside diameter of enclosure with recessed hexagon matches bolt mounting holes for DIN 3852 threaded pipe connectors. Any dirt and dust particles carried by particular medium are prevented from exiting. Sealing ring is embedded in radial and plane-sided recess that makes seal captive.