Standard 1/4 thread fits most guns and pipes. Filters can contain solid air contaminants such as limescale, rust and air condensation. It fits on your airline or mounts directly to the spray gun to prevent paint from contaminating the water. It is an essential tool for automotive refinishing, marine, construction, woodworking/furniture making and all industrial work. Air pressure adjustment knob to adjust air pressure as required. Comes with an oil-water filter separator to protect your spray gun and features an easy-open drain valve. Product Description: Specifications: Inlet Air Flow: 1/4 inch Main Colors: Blue and Transparent Blue Total Length 150mm (Approx.) Material: Aluminum Alloy + Iron + Plastic Working Pressure: 0-140 PSI/10 Bar