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. Another great feature of HornAir systems is that they come with a standard 1/2" OD push-to-pull fitting. This means the horns you hook up with get all the air they need. Also the perfect package 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.