Equip your semi to be Ready for the Road Ahead™, with the Holland FW Series 7.5" - 9.5" Stainless Steel Sliding Fifth Wheel Air Cylinder, a crucial device that ensures fifth wheel trailers lock in place. Due to its ability to actuate the locking mechanism of a trailer, this replacement piece is able to prevent trailers from disconnecting or rolling away. Crafted with a pressure relief valve for enhanced safety and control. FleetPride is your First Click in Heavy Duty®.