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Is there an option to put a metal screw-cap on an amber PET growler?

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2 answers

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Yes, you can use metal caps on plastic items.
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You most likely would have to purchase the metal screw caps separately, but yes, though rarely done, you should be able to put a metal screw cap on an amber PET growler (so long as you select the correct size).  Metal screw caps often have rubber or plastisol liners on the inside, so there should be no significant 'fit' difference between metal and plastic screw caps.
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