Complete 150-200 PSI Maximum Oversize Triple Train Air Horn System 500dB??? Three Full-size tuned train horn trumpets (17", 15" & 13") w/ High Flow Heavy Duty 1/2" Air Valve Continuous-Duty Rated 1/3 HP 150 PSI Compressor 3 Gallon Air Tank (Dimensions: 19" x 6" x 8") Kit includes a pressure switch (110 PSI on/145 PSI off), 12 ft of 1/2" air line, push button switch, all necessary tank fittings and mounting hardware Free Wiring Kit!