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This reusable 38 mm screw cap will fit our 1 gallon, 1/2 gallon jugs, and beer growlers. It is made of plastic and has a hole in the middle, which works best with our 3 piece airlock - item 7010. Perfect for small batch experiments or yeast starters.

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California Proposition 65

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⚠ Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.

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38 mm Screw Cap with Hole

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