The RAMHDOBA-6450 Onboard Air System is 100% Bolt-On and features a high output Kleinn waterproof air compressor and a Cortec coated 3-gallon air tank mounted on a custom, Made in the USA, mounting bracket. Using common hand tools, anyone can install their own onboard air system and train horn all without drilling a single hole! Includes a quick connect tire inflator with 160 PSI digital gauge and pressure release, remote mount quick connect and storage bag. Everything needed comes in one box for a professional & flawless installation. Onboard Air only systems also include a 160 PSI panel mounted gauge with 12-volt ON/OFF switch.