Arizona Plumbing Practice Exam 2026 – All-in-One Guide to Master Your Plumbing Certification!

The handle of a gas shutoff cock valve should be parallel to the pipe when it is in the "on" position. This orientation signifies that the valve is fully open, allowing gas to flow through the piping system. It is a standardized practice in plumbing and gas installations to use this alignment to indicate an open state, making it easier for professionals and homeowners alike to quickly identify whether the gas is on or off.

In contrast, a perpendicular position to the pipe typically indicates that the valve is closed, thereby cutting off gas flow. This clear visual distinction is crucial for safety and efficient operation, as it helps prevent accidental gas leaks. Other options that suggest different vertical or horizontal orientations would not convey proper operational status and may lead to confusion or potential safety hazards.