Hitachi EC99S 4-Gallon Portable Electric Twin Stack Hot Dog Air Compressor Motor thermal overload protection stops the motor in a possible overheating situation Cast iron, oil-lubricated pump for cooler operation and greater longevity 15 Amp direct drive induction motor delivers efficient and reliable performance Locking regulator ensures the proper pressure is delivered to your tool Industrial air pressure gauges, encased in steel, for higher durability 105 On/135 Off pressure switch for less cycling Universal quick coupler for fast tool changes Lightweight and portable for easy jobsite transport Ball valve drain cock for quick and simple tank draining