What you get: you will receive 3 water oil separators, the blue end (concave) is the "outward" side of the airflow, and 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 import export :standard universal male and female 1/4 inch NPT inlet and outlet designs make it easy to connect pneumatic lines to pneumatic tools and airbrush to accommodate most pneumatic tools for convenience Sturdy material: the water oil separator is made of polycarbonate housing, aluminum valve body and solid brass fittings, it has good anti-oxidation performance, which greatly improves the durability and reliability of the tool and prolongs its service life Extend tool life: clean air is essential in pneumatics, this filter can not only be applied as a water separator for air compressors, but also effectively trap oil and dust, so only clean air can to pneumatic tools; Greatly reduce the disposal of worn airbrush and other pneumatic tools, effectively extending the life of pneumatic tools Suitable applications: the water and oil separator can be directly connected to paint airbrush, air compressors and other pneumatic tools; It can be applied with airbrush, pneumatic tools and hoses, capable of capturing water vapor and oil particles entering pneumatic tools to extend tool life and provide cleaner operations, keeping your equipment performing at nice condition