Update your semi with a securely locked trailer, with the Fontaine 12-1/4" Compressed Center to Center Fifth Wheel Air Cylinder Kit that ensures you're Ready for the Road Ahead™. 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 compact and space-efficient body. FleetPride is your First Click in Heavy Duty®.