New U.S. Design Stronger Motor 8 cfm 2 stage Gas Ballast Valve Helps Prevent Oil Contamination Caused by High Moisture Easily Removable Vapor Discharge/Oil Fill Port. Contains Internal Check Valve to Prevent Escape of Liquid Oil Large Oil Level Sight Glass with Max/Min Oil Level Indicator Easily Accessible Oil Drain Valve Large, Light Weight Reinforced Base for Stable Positioning Field Replaceable Cartridge (6, 8, 12 CFM Models) Cooling Fins to Keep Temperature Cooler During Extended Motor Operation High Volume Fan Provides Cool Air to Motor and Pump Manifold Valve Isolates Pump from the System when Testing for Leaks. Includes 3 Inlet Ports, 1/4", 3/8" SAE and 1/2" ACME Dual Voltage Capability Thermally Protected Motor with On/Off Rocker Switch