Ridgid ZROF50150TS 5 Gallon Oil-Free Tri-Stack Air Compressor (Certified Refurbished) Powerful induction motor for maximum power, durability and quick starts Innovative steel tank design allows compressor to be configured for a wide range of tools, applications and environments Compressor and independently regulated tanks separate for easy carrying and versatile, simultaneous uses 1/4 turn tank drain, valve on each tank turns quickly and easily for convenient tank maintenance Oil-free, low-maintenance pump