The Prop Bag in use

The prop bag is used to cover a boat engine's propeller when it has been taken out of the water. In many countries a highly visible prop bag or other cover is a legal requirement when the boat is being towed on the public road, if it has any outboard engine or inboard drive leg and prop protruding from the hull. Even when it is not in motion, a propeller can be a sharp edged hazard to people. Covering it up with a thick, bright and weatherproof bag is a commonly favoured method to comply with the law and keep people safe.

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