Arnott's load-leveling suspension rear air spring A-2148 for the 1997-2002 Ford Expedition and 1998- 2002 Lincoln Navigator 4X2 is exclusively assembled and tested for Arnott by world-renowned Continental. This rugged air spring is made with high impact resin top and bottom mounts, multi-ply ContiTech air sleeve and includes a new seal kit. The air spring bladder has a tested burst pressure of more than 480 PSI, 6 times its normal working pressure. Arnott is so confident in the reliability of its aftermarket air springs that they are backed by a Limited Lifetime Warranty. NOTE: Arnott recommends changing the dryer when replacing air springs. Moisture in your system may damage the compressor.