Viking Horns 4 Trumpet Train Air Horn kit. With 150 PSI heavy duty air compressor and 1.5 gallon air tank kit. This Horn system produces a Loud Sound of 149 decibels. Trumpets are chrome plated metal. Will replace your original horn, or can be installed as an auxiliary horn. Includes Mounting Hardware, Brass Fittings, Air Hose, Electric Air Valve, 240 PSI Air gauge, 120/150 PSI Air Pressure Switch, installation instructions, and a Horn Button. Ideal for vehicles such as Truck, RV, SUV, Pick-Up, Boat, and many other applications.