Hot answers tagged troubleshooting
Absolutely nothing wrong with what you did.
Hose barbs in that size range seem to usually have a 1/16th inch wall thickness, so the bore would be 0.125" smaller than the corresponding hose. In other words, to get a minimum 1/2" ID in a hose barb, you'll need a 5/8" barb, and change your hoses to 5/8 as well. To answer the question above, try a hydraulic supply shop, Grainger, truck repair, etc. ...
It's not ideal, but it's probably not a huge problem, either. It's highly unlikely to ruin your brew. It's most likely happening because the wine in the carboy is cooling, thus reducing pressure inside the carboy, literally sucking the liquid from the airlock like a straw. Did you put the liquid into the carboy hot or warm? What's the ambient temperature ...
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