Filter Vent - Thread Size 1/4 Dia Hex Flats (In.) 3/4 in Height 1.19 in Top Cap Dia (In.) 3/4 in Base Square (In.) - Overall Length (In.) 1 3/16 in Max Operating PSI - PSI - Max Operating Temp - Filter 40 Micron Vacuum (In. Hg) - Aluminum 40 Micron Filter Element Easily Removed for Cleaning Relieve Excessive Pressure from Gearboxes