Ensure your semi is Ready for the Road Ahead with ample storage space for compressed air, with the Power Products 12" HT-1200 Style Smile Shaped Bracket Below Air Tank. To actuate a vehicle's air brakes, improve suspension, or power other devices, this solid-steel tank stores ready-to-use compressed air. Fashioned with an automatic drain valve controlled by a pressure switch. FleetPride is your First Click in Heavy Duty .