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This powerful triple trumpet air horn produces a loud roaring sound. Black color, made entirely of metal for maximum protection against all weather conditions. Horn comes with a 12V solenoid, hose and mounting hardware. An on-board air system is required for operation. Ideal for all vehicles with a 12V system. This horn is sure to draw all the attention you are looking for. Triple Trumpet Train Air Horn Color: Black Sound Output: 135dB 12V Electric Air Valve (solenoid) Construction: Metal Mounting Hardware: Gasket, Bolts and Nuts Dimensions: Overall: 13-¾" L x 6-½" W x 7-½" H Trumpets: 12" L, 10" L, 7-1/5" L x 3-¾" D Note: Onboard Air System Required