Get your semi Ready for the Road Ahead with a soft and smooth ride, with the Sampa SP 558864-KP Single Rolling Lobe Piston Air Spring for Peterbilt. With a bellow-like bag design, this replacement air spring lifts or lowers the ride height of a vehicle to optimize comfort, handling, or other features. Manufactured with tight seals to minimize air leakage and deliver superb suspension. FleetPride knows you need quality suspension and steering parts to reduce wear and tear and ultimately, downtime. Whether you need cab, truck or trailer air springs, we have the heavy duty air bags you need for a quiet, stable ride. FleetPride is your First Click in Heavy Duty .