Features and Benefits:Air vent fitting for allowing air to escape when internal pressures riseTrivalent zinc plating for resistance to corrosion1/8″ PTF connectionProtective cap prevents water or dirt from entering”ALEMITE” AIR VENT FITTING – 1/8″ PTFUse with transmissions, differentials, speed reducers, axles, gear housings, etc. Fitting is placed above normal lubrication level to allow air to escape when internal pressures rise.Highlights:Opening Pressure: Felt filter.Threads: (1/8″ PTF SAE) short.Vent opens at designated pressure. Helps to prevent fluid leakage. Special cap prevents water or dirt from entering.