What is a common characteristic of a piston mechanism in regulators?

A common characteristic of a piston mechanism in regulators is that it has a simpler design compared to other types of regulator mechanisms, such as diaphragm types. This simplicity arises from the straightforward movement of the piston within a cylindrical chamber, which allows for effective and reliable control of air flow. This design contributes to ease of maintenance and fewer components that can fail, making it a popular choice for many diving applications.

Other mechanisms may incorporate more complex features for varying performance characteristics or adapt to specific conditions, but the piston design remains favored for its efficiency and reliability.