Vintage hydrant flow gauge.

Fullsize image: https://s3-us-west-1.amazonaws.com/h...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