Which color tag on a UST fill pipe indicates ineligibility for product delivery?

• A. Green tag
• B. Blue tag
• C. Red tag
• D. Yellow tag

Answer: (C)

Red is used to signal ineligibility for product delivery. The color communicates an immediate stop to deliveries because the UST system is not ready—often due to maintenance, testing, or detected issues that must be resolved before it can receive fuel. This red cue helps prevent spills, overfills, or violations by ensuring drivers and site personnel don’t push product into a tank that isn’t prepared to receive it.

A green tag, by contrast, typically indicates the system is approved for delivery and can receive product after standard checks. Blue or yellow tags are used for other statuses or warnings in various programs, but they do not carry the same definitive prohibition as red.