Get your semi Ready for the Road Ahead with advanced security to lock fifth wheel trailers in place, with the Holland 14.875" - 18.75" ILS Series Fifth Wheel Air Cylinder Assembly. With a compressed-air system, this replacement device is able to actuate the locking mechanism of a fifth wheel assembly to prevent it from rolling away or disconnecting. Built with high-quality materials to deliver a long-lasting service life. FleetPride is your First Click in Heavy Duty .