Firefighters flushing a fire hydrant - GIF

Firefighters flushing a fire hydrant.

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Previously:

Ambulance explodes in front of firefighters - GIF
Firefighters driving through wildfire - GIF
Firefighters respond to a call in Venice - GIF
Firefighters test dry powder fire bombs - GIF
Out of control hose training for firefighters - GIF

Common practice to allow your mask to beat around like that?

Must be a training exercise, making the guy do it in full gear. Around here, they drive around
in a pickup truck in their regular "street clothes" type uniforms to do that.