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How to use a hydrant?

When using a fire extinguisher, it is high pressure, which may cause the splash of the burning material and cause the fire extinguisher to be injured, so keep an appropriate distance. source root
1. Pull out the safety pin.
2. Pull out the leather tube and aim at the root of the fire source.
3. Depress the handle.
4. Shoot the root of the fire source from left to right, and cover the fire with dry powder.
5. After the fire is extinguished, use water to cool the residual temperature and keep monitoring to confirm that it is extinguished.