High Pressure Compressed Air Filter, 3/8 NPT, 725 PSIG Max, 147 SCFM, Walker Filtration 50HP37. Walker Filtration offers a unique range of high pressure (725 PSIG Max) compressed air filters for industrial, military, laboratory, and other applications. These filters are constructed of die cast aluminum components and feature easy-to-install push on elements with double o-ring seals. Each housing has a corrosion resistant e-coating for superior durability. Max Pressure: 725 PSIG. Inlet / Outlet Connections: 3/8 NPT. Filter Element Options: 25, 5, 1. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. Moisture Boss 39907175 Oil Filter, Compatible with Ingersoll Rand 39907175. EFC89559379 Gardner Denver Oil Filter, OEM Equal. EFC89675429 Gardner Denver Oil Filter, OEM Equal. EFC89755919 Gardner Denver Oil Filter, OEM Equal.