Loud Mouth 150 PSI Quad Train Horn Kits VIAIR 120 PSI Fast-Fill Air Source Kit - The air tank and compressor combo that is used for this kit is a professional VIAIR 1.5 gallon, 120 PSI fast fill 2000 measuring out at 15.2"long x 5.9" wide x 12.8" height. The 120 PSI Air Source Kit comes with a low amp-draw, 25% duty cycle, 275C VIAIR compressor mounted on a 150 PSI-rated 1.5 gallon air tank with 5 ports. 100% Steel & Chrome plated Train Horns - This kit includes a four trumpet train horn that pounds out a loud and proud authentic train horn sound. Each horn is sixteen inches long and will be placed in an assembly that is about twelve inches in height. Each trumpet will work with its own unique note to help with creating the robust sound that comes from a train horn setup. Toggle Switch Kit w/15 feet of wire - A toggle switch kit is also includedin this kit. This enables the loud mouth train horn kit to be activated with ease by using a simple switch that is separate fromwhat is used for activating the standard car or truck horn. All wires and connectors used to get this switch kit to work properly are included. 15 feet of air line - There is plenty enough air line for the train horn kit to work in just about any application. There is fifteen feet of air line included in the kit. Vibration Dampeners & Connectors - Rubberized vibration dampeners and connectors ensure that your horn kit is mounted securely without any annoying vibration.