Before you dive with any Gas or electric hookah oil less compressor make sure it has proper filtration.

Low cfm air pumps *may not work* with these filters as they can cause too much back pressure resulting in a loss of airflow at the regulator.

You are breathing directly from these systems.  Most air pumps have a fine particle filter to capture large dbris and dust particles before the enter the pump.  But they do not stop finite particles like this filter will.

 These filters help aid particles from being directly inhaled.

The water separator (blue/clear) should be installed at the compressor. 

The in-line filter(silver) should be installed at the end of the hose near your low pressure 2nd stage regulator. 

What you get: you will receive 1 water oil separator Filter plus 1 - 40 micron filter (shown in the picture taken apart).  2 pieces only.

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.  (End cap colors vary from Blue, to black, to orange, etc.)

Standard universal male and female 1/4 inch NPT inlet and outlet designs make it easy to connect inline from your pump to airline.

Sturdy material: the water oil separator is made of polycarbonate housing, aluminum valve body and solid brass fittings.

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 pass on to.

Suitable applications: the water and oil separator can be directly connected to any air pump or compressor, capable of capturing water vapor and oil particles to provide cleaner air.