1. Standard 1/4 thread fits most spray guns and airlines. Filters can hold airborne solid contaminants such as pipe scale, rust, airline condensation. 2. It fits into your airline or directly onto a spray gun to prevent paint from contaminating water, and it is an essential tool for automotive refinishing, marine, construction, woodworking/furniture making and all industrial work. 3. Air pressure adjustment knob, can according to need to adjust the air pressure. 4. With oil and water separator filter to protect your spray guns, has a drain valve at easy release. Specifications: Air Inlet: 1/4" Main Color: Blue & Clear Total Length 150mm（approx） Material: Aluminum Alloy + Iron + Plastic Working Pressure: 0-140PSI/10 Bar Package Content: 1 x Mini Air Pressure Regulator 1 x Inline Water Trap Filter