Slam Specialties new AU-7 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-7Diameter "0" PSI- 7"Diameter MAX PSI- 8"Single 1/2" portRated @ 200psiMax Weight Rating 3500lbs.Plate Material - SteelMin. height 2.8"Max. height 11.5"Mounting (Top) - (2) 3/8" - 16Mounting (Bottom) - (3) 3/8" - 16Air Port NPT - (1) 1/2"Force to Collapse 50lbs.Shipping Weight each - 5.6lbs.Replaces - Airlift D2600