This compact Regulator/Filter is a great size for a small workshop or garage. This unit is designed to filter your air to keep debris and liquids from getting inside your equipment. Additionally, it permits you to dial in and maintain the correct air pressure. Install the Regulator/Filter in your line close to your air source to filter out any moisture or debris. Includes poly cup for debris containment which can then be thrown away. This unit can be used on our #2229-A or #1148-A Vacuum Generators, any of our Gel Coat Spray Guns and our #171-A Chopper Gun. Max PSI 150. Connection to our #171 Chopper Gun and #120 Gel Coat Cup Gun requires a #2222 Male Nipple. Connection to our #123 or #126 Gel Coat Touch Up Guns require a #2223-A Female Nipple.