1FUNCTION AND ACTION: The water and oil separator trap water vapor and dust, preventing dust and moisture from damaging pneumatic tools and accessories, so that your equipment can maintain the best performance 2OUTSTANDING DESIGN: The water and oil regulator is equipped with a 0 to 150Psi dial gauge, and the pressure modulation and filtration are combined to make adjusting the pressure value a breeze 3SIZE SPECIFICATION: The air conditioner has 3 holes, two 14in NPT holes and one gauge port 18in NPT, suitable for many pipe port sizes 4ADJUSTING KNOB: The air pressure regulator has a plastic adjusting knob for smooth tap flow settings, and the knob has a locking function that cannot be turned when the knob is pressed 5DURABLE MATERIAL: Automatic drain air line filter is made of excellent ABS material, which is built to last, can withstand high pressure up to 150PSI, ensuring long lasting performance