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The Horn setup
Mounted on the truck is my old style K5LA with Amtrak snow cones and on the far side is my P5LAC. Note the two locomotive horn valves, bell, and air fill station which includes the standard quick disconnect for my compressor at home, and an air chuck incase only a tire valve is available. Below that is an air filter to keep as much water and other garbage out of the tank's air supply.