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I use vented bungs with Carlo Rossi 4 liter jugs. It takes a bit of finessing to them them in, and only 1/4" fits inside the jug mouth. However, I'd had wines in this situation for a year with no problems.The valve on mine seal fine -- if the temperature drops, air cannot get in. The reverse is opposite, if temperature rises air will be pushed out, as can wine if the container is too full; however, this is normal behavior as the purpose of the valve is to let air out.
I use vented bungs with Carlo Rossi 4 liter jugs. It takes a bit of finessing to them them in, and only 1/4" fits inside the jug mouth. However, I'd had wines in this situation for a year with no problems.
The valve on mine seal fine -- if the temperature drops, air cannot get in. The reverse is opposite, if temperature rises air will be pushed out, as can wine if the container is too full; however, this is normal behavior as the purpose of the valve is to let air out.