Growler 38mm Polyseal screw caps fit 1/2 and 1 gallon glass jugs. Package includes 4 caps.
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This cap busted upon using it once actually broke immediately tigting on I've never had this happen before with other plastic caps. I need them to hold carbonation. I don't trust these as much as the metal caps.
Caps are what I wanted. No more rust on mouth of bottle.
I am satisfied with the caps, I havenít done any research comparing these to other caps but they are easy to use and appear durable.