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This trap is used by securely screwing it to a standard soda/water bottle. Bait is placed in the bottom of the bottle to attract fruit flies, and the Bottle Cap Fruit Fly Trap prevents the fruit flies from exiting the bottle once they have entered. When the trapping process is completed, the original cap of the bottle can be placed back on for a self contained bottle of fruit flies. The bottle containing the fruit flies can then be disposed of, and the trap can be used again when needed.