Equip your semi truck to be Ready for the Road Ahead with the Power Products 2-13/16" Spring End Cap, a key component that protects the suspension from dirt and contaminants. By gently fitting on the outside of the spring, this replacement end cap is able to lock out contaminants and prevent damage. Constructed with high strength steel that is both damage and corrosion resistant. FleetPride is your First Click in Heavy Duty .