... screw air compressorUNLOADING VALVE KIT,MIN.PRESSURE VALVE KIT,FILTER KIT G,CHECK VALVE KIT,SEWAGE VALVE COMPONENTS,OIL STOP VALVE KIT,COOLERS KIT ... ,WATER SEPARAT,THERMOSTAT KIT,WATER VALVE COMPONENTS,OIL SEPARATOR ... of outside debris, 100% gas Supply.2, Oil stop valve of the main functions: to prevent oil back turning ...