This professional air compressor filter regulator is designed as a single air treatment unit, combining stable pressure regulation and efficient air filtration in one compact body. Built with high-quality metal construction, it offers excellent rust resistance and long-term durability for daily industrial and workshop use. Equipped with a precision brass filter element, it effectively removes moisture, oil mist and impurities from compressed air, protecting pneumatic tools and equipment from damage and blockage. The adjustable pressure range from 0 to 145 PSI allows flexible control for different working needs, while the clear gauge enables real-time pressure monitoring. The manual drain design supports quick water release and pressure relief, helping reduce internal corrosion and extend service life with simple maintenance. With standard 1/4" NPT connections, this unit is easy to install and widely compatible with spray guns, air wrenches, sanders, nail guns and other pneumatic tools. Suitable for garages, automotive repair shops, woodworking stations, maintenance workshops and various pneumatic applications, it provides clean, stable air supply to ensure consistent and reliable operation.