What you will get: You will receive 3 water oil separators, the blue end (concave) is the "outward" side of the airflow, the connector side (convex) is the inlet for the airflow, they are easy to install and ergonomically designed For your convenience and ease of use General Inlet and Outlet: Standard universal male and female 1/4 inch NPT inlet and outlet design for easy connection of air lines to air tools and spray guns to fit most air tools for ease of use Robust material: The water oil separator is made of polycarbonate housing, aluminum valve body and solid brass fittings, which has good oxidation resistance, greatly improves the durability and reliability of the tool, and prolongs the service life Extend tool life: Air tools need clean air, this filter can not only act as a water separator for air compressors, but also effectively trap oil and dust, so only clean air can be used for air tools; greatly reduce wear and tear on spray guns, etc. Disposal of air tools to effectively extend the service life of air tools Applicable applications: The water-oil separator can be directly connected to air tools such as paint spray guns, air compressors, etc.; it can be used with spray guns, air tools and hoses to capture water vapor and oil particles entering air tools to extend tool life and Provides cleaner operation to keep your equipment in good condition