Final answer:
An inspector is not required to operate main shut-off valves as it poses a potential risk for damage or leaks; their role instead covers operating plumbing fixtures, observing functional flow, and describing water heating equipment.
Step-by-step explanation:
You asked which action is NOT required of an inspector. The answer is that an inspector is not required to operate main shut-off valves. This is because doing so can pose a risk of causing damage or a leak if there is an undetected problem with the plumbing system. The inspector's role typically includes operating all plumbing fixtures, observing functional flow to ensure that the system is working properly, and describing the water heating equipment. However, manipulating main shut-off valves is generally beyond the scope of a standard home inspection and is usually left to a qualified plumber.