20 Gallon Oil Drain Tank, Portable Oil Drain Container with Adjustable Funnel Height 38"-65", Air Operated Drainage Fluid Fuel Transfer Drainage with 360° Wheels & Toolbox. 20 Gallon Capacity - With an 20-gallon capacity, this portable oil drain container efficiently collects used oil from 8-10 vehicles and operates pneumatically for quick and effective emptying of waste oil.