Slam Specialties new AU-6 Series bags. Clean sheet proprietary bellow design. Increased weight weight rating. Direct bolt-in for similar sized air springs. High performance at a better price. Model bag AU-6Diameter "0" PSI- 6"Diameter MAX PSI- 7"Single 1/2" portRated @ 200psiMax Weight Rating 2800lbs.Plate Material - SteelMin. height 2.675"Max. height 10.25"Mounting (Top) - (2) 3/8" - 16Mounting (Bottom) - (3) 3/8" - 16Air Port NPT - (1) 1/2"Force to Collapse 26lbs.Shipping Weight each - 4.2lbs.Replaces - Airlift D2500