Outfit your semi truck to be Ready for the Road Ahead with enhanced tailgate control, with the Velvac 3-1/2" Push / Pull Double Acting Air Cylinder. With a specialized design, this replacement cylinder is able to pair with an air compressor to control the movement of a pneumatic or hydraulic tailgate. Manufactured with durable materials to be suitable for commercial vehicles, tractors, and more. FleetPride is your First Click in Heavy Duty .