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3 Piece Airlocks with #7 rubber stoppers. (pack of 3 airlocks with 3 matching stoppers)Use this airlock and stopper in your fermenter to create a closed system that allows CO2 out and prevents harmful bacteria from getting in. Fill to the marked line with sanitizer or boiled water. Use with a drilled stopper. These stopper fit most gallon jugs and 38mm screw cap jugs. Dimensions:, Econolock airlock, 3-piece cylinder airlock - Set of 3, #7 stopper with airlock hole - Set of 3, Country of origin - Canada, Manufacturer name - Home and Kitchen Store.