Vent Plugs act as supporting accessories for Hoan Microwave vibration isolation systems. All HA-series vent plugs adopt metal housing with built-in e-PTFE breathable membrane in threaded and push-in two installation types, equalizing sealed cavity pressure as essential standard part for closed cabinets. Rated IP68 protection, sub-models including HA-4A and HA-12A are standardized on air permeability and water withstand pressure, working from -40℃ to +125℃ to remove inner condensation and block dust & liquid infiltration. These vent plugs fit isolator-installed equipment cabinets, outdoor control boxes and sealed instrument housings via simple screw mounting. Matching-spec vent plugs are supplied together with bulk isolators from the factory; Hoan Microwave develops custom non-standard thread pitch and outer diameter vent plugs per clients’ cabinet hole dimension.