Every drinking fountain bubble should include a means of regulating what?

The ability to regulate flow to the orifice in drinking fountain bubbles is crucial for providing a consistent and safe drinking experience. This regulation ensures that water is dispensed at an appropriate rate, which can prevent issues like overflow or splashing, making the fountain more user-friendly and sanitary. Additionally, maintaining a steady flow helps ensure that the water remains fresh and uncontaminated, as allowing for erratic flow could expose the water to contaminants or bacteria.

In contrast, while pressure can influence the operation of fountains, it is typically managed by the plumbing system as a whole, rather than needing specific regulation for each individual fountain bubble. Temperature regulation is also essential for providing comfortable drinking water, but it’s not commonly managed at the fountain level; rather, it relates more to the overall plumbing setup and source. Volume control may also play a role in managing water conservation but isn't as directly associated with the function of the drinking fountain as flow regulation is. Thus, flow regulation is the most critical aspect ensuring that fountains adequately meet usage needs while promoting health and functionality.