The OTC Hendrickson Airtek NXT Bushing Adapter Kit, No. 4255, is designed to be used in conjunction with the company's 4263 Suspension Bushing tool to remove and replace leaf spring bushings. The adapters and cups allow bushings to be easily pressed out and new bushings to be pressed in, the company says. The adapters aid users to ensure a straight, clean installation of vital suspension bushings, making bearing removal and installation faster and easier. The adapters are specifically designed to fit the front leaf spring and bushing, while all parts are specifically designed to fit the Airtek NXT front suspensions found Freightliner Cascadia vehicles.