MPC Dual Air Horns Loud Locomotive Train Horns Complete Kit Oversized Dual Chrome Train Horns (15" & 13" Trumpet Length) w/ 12v Solenoid 120 PSI Sealed Air Compressor w/ Remote Intake (Dimensions: 7.5" x 2" x 4.5") 1 gallon Air Tank w/ 5 x 1/4" NPT ports (Dimensions: 7.75" x 5.75" x 8") Kit includes a pressure switch (90 PSI on/120 PSI off), 12 ft of 1/4" air line, push button switch, all necessary tank fittings and mounting hardware Free Wiring Kit!