Prepare your semi to be Ready for the Road Ahead , with the Power Products 9.5" HT-9500 Style Smile Shaped Bracket Below Air Tank that provides ample storage space for compressed air. 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 .