What NFPA diamond numbers are required on a propane tank?

The NFPA (National Fire Protection Association) diamond for a propane tank typically displays a number "3" in the flammability (red) section, indicating that it is highly flammable. The health hazard (blue) section usually shows a "1," indicating a low level of toxicity. The reactivity (yellow) section generally has a "0," indicating that it is stable under normal conditions. The specific numbers can vary based on the tank's size and intended use, but these values are common for propane storage.