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what does the trailer air supply control look like a it is a square blue knob B it is a triangular yellow knob C it is an eight-sided red knob d it is a circular orange knob see it is an eight-sided red knob on newer vehicles the trailer air supply control as an eight-sided red knob its used to control the tractor protection valve in a vehicle equipped with an automatic tractor protection valve the valve will pop out when a air pressure drops to a level between 20 and 45 psi B you are experiencing a trailer jackknifed C wheels have regained traction after a skid D air pressure as above 45 psi you a air pressure drops to a level between 20 and 45 psi in vehicles equipped with an automatic tractor protection valve the valve will pop out if air pressure drops to a level between 20 and 45 psi when the valve pops out the protection valve will close stopping the flow of air when coupling a trailer a make sure to couple matching gladhands be any glad-hand can be connected to any other glad-