Vintage hydrant flow gauge.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...e_fullsize.jpg
Previously:
Fire hydrant cutaway - photo
Firefighter gets blown away by fire hydrant - GIF
Firefighting foam aerator - GIF
Fire hose winding attachment for cordless drill - GIF, video, photos
Firefighting missiles for highrise buildings - GIF
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