The oversized pressure gauge (76 mm in diameter) has a range of 0-2.7 bar (0-40 PSI) and an accuracy of +/-2% for maximum precision when inflating large tires. With a volume of 508 ccm, it has enough power to seat stubborn tubeless tires onto the rim. It features an ergonomic handle with a pressure relief valve. The SwitchHitter II head automatically switches between Schrader and Presta valves. Includes a replacement rubber gasket for the head. Maximum pressure: 2.7 bar (40 PSI). Volume per stroke: 508 ccm.