This 21-Gallon Oil Drain was built with professionals in mind and was designed to be used when changing oil, transmission fluids, and more for automobiles and light trucks. This oil drain can be placed under a lifted vehicle utilizing the stable fixed wheel and fixed axel combination as well as the telescoping funnel to accommodate various working positions. When the tank is full, pressurize the tank with an air connection after closing the appropriate valves and then drain will evacuate into your waste oil tank.