MPC Train Horn Kit w/Compressor Water & Dust Resistant 120 PSI 12v Air System Chrome Compact Triple Air Horn (Dimensions: 13.75"L x 7"W x 6.5"H) w/ 12v Electronic 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!