MPC Air Horns for Trucks; Dual Big Rig 25" w/100% Duty, 150 PSI 3-Gallon Air System Two Chrome Big Rig Truck Horns (Dimensions: 25"L x 7.75"W x 5.5"H) w/ 12v Electronic Solenoid 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 1/4" air line, push button switch, all necessary tank fittings and mounting hardware Free Wiring Kit!