Buoy vent

From International Dictionary of Marine Aids to Navigation
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A conduit connected to the battery pocket in a buoy, open to the atmosphere, but usually self-sealing against ingress of water. The vent allows release of gas from the cells of the battery. It may also allow ingress of air.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM