This kit is designed for large applications, whether it be full-size train horns or heavy use for air tools, tire inflation, or any other mobile air application, this is the ultimate kit. This package is perfect for filling up load-leveling air springs. If your truck has air springs without a compressor setup, this is the perfect compliment. Please note that if you use horns, you will still need an air valve kit to connect the system properly. Unlike some other air systems, HornAir kits come with 10 and 18 gauge wire, and a complete wiring kit including a fuse holder. This takes out the guesswork on your end and helps ensure your system is installed correctly. Recommended for use with Shocker S4 Train Horns and AirChime K-Series Train Horns.