This 38mm plastic screw cap features an airlock hole in the center (accepts all plastic airlocks). Handy to use with 1 gallon screw cap jugs when making mini fermenters.
May 23, 2019 by Andrew
Q: Do these work on 1 gallon plastic jugs? Or only on glass?
A: These also fit on standard plastic jugs.
Sep 04, 2018 by Gil
Q: I have some of these air lock caps however the holes were too big for my air locks and had to rig a rubber ring to make then air tight . I want some caps that are made to fit the air lock to be air tiight. thanks
A: Ours say 'Vintage Shop' on them, so if these are the same as the ones you already have, they will not work.
Works Great
I have 5 of these on 1 gallon fermenters and they all arrived in good condition and make for a convenient seal with my air locks. Love them.
Don't buy these
I don't know if it happened during shipping or if I screwed it on too hard, but my cap had a crack in it that let air seep out instead of going through the airlock. Hopefully it won't compromise my brew. I wish I would have decided to go with a bung instead.