Air Lock Screw Cap - 38mm

38 mm screw cap with airlock hole for one gallon jugs. Use instead of stoppers on gallon jugs for yeast starters or experimental small batches. Works best with a 3 piece airlock.

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Specifications:

• Made out of Plastic
• Fits most 1/2 gal sized growlers
• 7/16" Airlock Hole Diameter