What you 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 for the airflow. They are easy to install and ergonomically designed for convenience and ease of use. Standard design: Universal 1/4 inch NPT male and female inlet and outlet connections allow easy attachment to pneumatic lines, air tools, and airbrushes, compatible with most standard pneumatic equipment. Durable construction: The water oil separator features a polycarbonate housing, aluminum valve body, and solid brass fittings. It offers good oxidation resistance, enhancing durability, reliability, and service life. Protects pneumatic tools: Clean air is essential in pneumatic systems. This filter functions as a water separator for air compressors and effectively captures oil and dust particles, ensuring only clean air reaches the tools. Helps reduce wear on airbrushes and other pneumatic tools, extending their operational life. Wide application: Can be directly connected to airbrushes, air compressors, and various pneumatic tools. Works with air hoses and pneumatic systems to capture moisture and oil contaminants, promoting cleaner operation and maintaining equipment in optimal condition.