What you get: you 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 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: 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 can lead to pneumatic tools; Greatly reduce the disposal of worn airbrush and other pneumatic tools,