These 38mm threaded caps work with compatible growler size 64 oz and 1 gallon jugs to convert them to fermenters for small batches and yeast starters. They feature an airlock hole.

KCHEX DRILLED AIRLOCK CAPS 4 38/400 FOR BEER WINE FERMENTERS & ONE 1 GALLON GLASS JUGS – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link

KCHEX DRILLED AIRLOCK CAPS 4 38/400 FOR BEER WINE FERMENTERS & ONE 1 GALLON GLASS JUGS

$6.90

38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]

$8.61 ($0.72 / Count)

38 mm White Growler Caps Lids, Seal Screw Caps Lid,Tinplate Metal Screw Caps with White Filling Glue Fits for Most 1/2 and 1 Gallon Jugs (36 Pieces)

$9.99

12 Pack 38mm Growler Caps Growler Lids Poly Seal Screw Caps Poly Seal Growler Caps Compatible with 1/2 Gallon and 1 Gallon Glass Gallon Jugs Replacement for Homebrew Wine Making Beer Brewing, Black

$8.99

Home Brew Stuff 75012WT White Metal Growler Caps 38mm Fits Most 1/2 and 1 Gallon Jugs (12)

$8.78 ($0.73 / Growler Cap)

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