Air Lift Air Springs 80231 This Air Lift replacement cylinder is an exact replacement for an original Air Lift 1000 air spring. It is made with sturdy urethane construction and the air fitting is molded in to the spring. This cylinder has a diameter of 4 inches and a height of 11 inches. Air Lift 1000 Replacement Bag Air Lift 1000 Replacement Bag; For PN(80531); Air Lift Replacement Air Spring - Red Cylinder Type