Underground gate valve is permitted with which accessory for underground use?

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Multiple Choice

Underground gate valve is permitted with which accessory for underground use?

Explanation:
Underground valve position must be visible from above ground, so a device that shows whether the valve is open or closed is required. A listed indicator post designed for underground use provides a durable, surface-visible indication of the valve’s position, allowing quick verification by responders or operators. The other options don’t fulfill this specific requirement: remote supervisory position indication isn’t the standard for buried valves in this context, antifreeze solution isn’t a positioning accessory, and a drain valve serves a drainage function rather than indicating valve status.

Underground valve position must be visible from above ground, so a device that shows whether the valve is open or closed is required. A listed indicator post designed for underground use provides a durable, surface-visible indication of the valve’s position, allowing quick verification by responders or operators. The other options don’t fulfill this specific requirement: remote supervisory position indication isn’t the standard for buried valves in this context, antifreeze solution isn’t a positioning accessory, and a drain valve serves a drainage function rather than indicating valve status.

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