The double-line Deadman Refueling hose is for automatic shutoff at the operator end of aircra hydrant and truck refueling systems. Used with pneumatic closed circuit systems commonly referred to as single point pressure refueling. Deadman hose is connected to air-actuated shut-off valves which are controlled by the refueler technician at all times during aircra refueling operations. Nitrile synthetic rubber ARPM class A (high oil resistance)