What is the method of dispensing real ale using gravity?

Dispensing real ale using gravity involves utilizing the natural force of gravity to draw the beer from a container, such as a cask or barrel, which is placed at an elevation above the tap or outlet. In this method, the beer flows downwards through the tap without the need for mechanical or pressurized means. This approach is traditional and aligns with the principles of serving real ale, which is typically not carbonated artificially. Utilizing gravity helps maintain the integrity and flavor of the beer, giving it a natural, unspoiled quality.

The other methods listed do not adhere to the gravity dispense principle. For example, using a pump located below the bar would require mechanical assistance to draw the beer, while a pressurized system would force the beer out using CO2 or nitrogen, both of which are contrary to the real ale serving ethos. Dispensing directly from a can or bottle does not utilize a traditional cask system and is generally not how real ale is presented, as real ale is best enjoyed fresh from a cask.