Which is not a requirement for a flushometer?

A flushometer, which is a device used for flushing toilets or urinals, must meet specific requirements to ensure proper function and safety in plumbing systems. The choice that suggests the requirement for a flushometer to be made from "chrome plated brass 12 gauge" does not align with the necessary features that define a flushometer's operation. While materials are important, specific gauge requirements may vary or not be strictly mandated under the plumbing code.

The focus on accessibility and safety features, such as having a backflow preventer and a manual flush handle, illustrates critical functional and safety standards that apply to flushometers. These elements help ensure that the device operates efficiently and prevents contamination of the potable water supply. For example, a backflow preventer is crucial in protecting drinking water from potential pollutants that might enter through the flushometer.

Therefore, the requirement for the flushometer to be chrome-plated brass of a certain gauge is not universally stipulated in the plumbing code, making it the correct choice as the option that is not a requirement for a flushometer.