It consists of three parts: which are black part for air pressure regulators, green part for water filter and the last part for stainless steel adapter The air filter is made of plastic and aluminum alloy, rust resistant and lightweight, and can be installed on various air tools without any burden on you. It is simple and convenient to grip. The pressure regulator can be adjusted from 0-10BAR (0-150PSI). The dial can display the pressure value clearly and accurately, and the pressure can be adjusted through the knob. 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 The air adjusting regulator valve is suitable for most spray tools and airlines, such as spray paint gun, air pressure cleaner, airline dryer and so on, which can be applied as a compact filter for air spray guns ENDOZER G1/4" Inlet and Outlet Air Compressor Water Separator Clean Dry Air, with Drain Valve and Pressure Regulator for Spray Gun