38mm Polyseal Screw Cap - Single Fit The 1/2 and One Gallon Glass Jugs (Item # 5188 & 5190).
Hello, I'm Dr. MyStein. You can ask anything about this product, homebrewing, winemaking, or general fermentation. I can create beer, mead and other recipes for you. Please keep in mind that I'm an unsupervised A.I., so it's best to double check the information I give you.