What you will get: You will receive 3 water oil separators. The blue end (concave) is the outlet side of the airflow, and the connector side (convex) is the inlet. They are easy to install and ergonomically designed for convenience and ease of use. General Inlet and Outlet: Features standard universal 1/4 inch NPT male and female inlet and outlet connections for easy attachment to air lines, air tools, and spray guns. Compatible with most air tools for convenient use. Robust material: Constructed with a polycarbonate housing, aluminum valve body, and solid brass fittings. Resistant to oxidation, ensuring durability, reliability, and extended service life. Extend tool life: Air tools require clean air. This filter functions as a water separator for air compressors and effectively captures oil and dust particles, allowing only clean air to reach the tools. Helps reduce wear on spray guns and other pneumatic tools, thereby extending their operational life. Applicable applications: Can be directly connected to air tools such as paint spray guns and air compressors. Use with spray guns, air tools, and hoses to capture water vapor and oil particles, promoting cleaner operation and helping maintain equipment performance.