Oil-free unit for durability and no maintenance. Equipped with High Flo regulator to allow for more workable air pressure (110 PSI start and 135 PSI stop pressure switch). Protected panel-mounted air controls and outlets. Features two universal, quick-connect couplers, easy-to-read pressure gauge and roll cage. 4-gallon tank supports heavy usage of stapler, finish, framing and roofing nailer. OSHA certified. U.S.A.