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38mm Poly-Seal Screw Cap

  • The preferred choice for sealing beer and other beverages in standard American 1/2 gallon and 1 gallon glass jugs with a 38mm thread diameter. The conical polyethylene liner creates an air-tight seal to preserve carbonation and minimize oxidation. The caps can even be re-used for a limited number of times. The functional life of the cap can vary greatly depending on the frequency of use, the type of cleaning products used on the materials, etc. Therefore, before re-using a cap, please make sure to check that the inner seal is soft (yet firm), not deformed or brittle. Food-grade. BPA-free.


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