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This chrome look trumpet produces a loud powerful sound. Constructed of metal to ensure maximum strength and durability with a front pedestal that eliminates vibration at high speeds or on rough roads. Horn comes with a 12V/24V solenoid, weather protection cover, hose and mounting hardware. An on-board air system is required for operation. Ideal for semi-trucks, and all vehicles with a 12V/24V system. Semi Truck Single Air Horn (Chrome Plated) Metal Construction Front Weather Protection Cover 12V/24V Electric Air Valve (Solenoid) with Compression Fitting 3/8" OD Nylon Plastic Hose (10 Feet) Mounting Hardware: Bolts, nuts, washers, mounting gaskets Dimensions: Horn: 24-½" L x 5-½" H Opening: 7-½" W x 4" H Note: Onboard Air System Required