Filter principlePure physical filtration, precision copper filter, independent filter cover, effectively filter moisture to achieve water and oil separation. The bottom is equipped with a manual check valve to discharge collected pollutants. AccessoriesUsed to connect to the inlet of pneumatic tools to filter impurities and moisture in the air. The standard BSP thread means this fits perfectly between most spray guns and air compressors, and will work with high horsepower air tools. Maximum pressure: 9.9 kg/cm2. Widely UsedThis compressed air filter has a wide range of applications, and meets or exceeds original factory specifications, can be directly replaced to meet your various needs. Universal 1 or 4" NPT inlet and outlet design easily connects air line to air tools and spray guns. Maintenance To clean or replace the filter element, simply remove the filter element and blow it from the inside out with an air gun. Wipe the clear PC outer cup with a clean cloth. Do not use chemicals that will damage the PC material.