Plastic Screw Cap (38 mm) - For Growlers, Gallon and 1/2 Gallon Jugs
Description
Plastic screw caps for growlers and wine jugs. Standard 38 mm size (38/400 thread) for growlers, 1/2 gallon, 1 gallon, and 4 Liter wine jugs. White color with foam liner.
These plastic caps do not seal at all. I had one break the threads, snugged down they do not seal. I had three growlers pour flat because of these caps. It was not my beer, regular bottles with traditional caps all had great carbonation. Last night I thought my last growler would be fine, the cap was tight enough it was a little hard to get off, but again, the beer was flat. Stick with the metal caps and replace when they rust.