Fast efficient air pump reduces lifting time and has a built-in relief mechanism which prevents the jack from being used beyond its maximum allowable capacity.; Convenient push button air valve connected to an in-line filter prevents contaminates from entering the air/hydraulic system.; Unique design allows for manual operation when air is not available.; Two piece zinc plated handle.; Parkerized coating on pump piston, extension screw and extension adapters and chrome coated ram offer protection against rust.; Longer wear life due to internally machined oil passages, smooth bearing surfaces and close tolerances.; Safety bypass and overload systems prevent cylinder damage and prevent the jack from being used beyond the ASME/PASE load-limiting standard.; Carrying handle.