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This Seachoice portable air horn provides a sound warning systems for boating, sporting events, etc. Signal horns are filled with Tetrafluoroethane gas, a non-flamable, safe gas. These signal horns meet US Coast Guard requirements for boats up to 39 feet in length. Often called Safe and Sound horns because of the labelling on the side of the canisters. Refills of 8 oz. gas canisters are also available.