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Wine: for home-brewed , wine, cider, and secondary ,brewing supplies For: standard size , fit any homebrew stopper, cork, cap, plug, bung, or a grommet with a 3/8 inch hole,beer making For fermenting: easy to use, fill water into the exhaust valve, insert to the cover of barrel or rubber plug on the of the container, cover with the lid,exhaust water sealed check valve Grommets: isolate the air from the wine/ , discharge carbon dioxide and gas, prevent flying into the wine/ and harmful getting in,fermenting bucket Brewing: one way exhaust water sealed check valve, prevent back-flush into the chamber during ambient temperature changes in the room, ASIN B0DJF384QV Item Weight 4 ounces Manufacturer OKUMEYR Item model number KMYPX22RBW509DW289AO1WPUS Product Dimensions 4.72 x 1.5 x 1.5 inches