One-gallon brewing: rubber stopper MUCH better vs screw top

I could see that the beer was fermenting, since the glass is clear and the bubbling is obvious. But by this morning, the bubbling had all but stopped. So I prepped some more yeast and added that (which did get fermentation cranking again). However, I noticed that the sanitizer (added to the airlock) was leaking out at the base of the airlock where it meets the screw cap. That meant that I did not have an airtight seal, and that meant that oxygen could be getting into the beer, which is not good.

Obviously, my jury-rigged attempt to secure the airlock to the screw cap was not yielding a tight enough seal. So off I went to my favorite homebrew supply shop (Southern Brewing & Winemaking here in Tampa). They have a great stock of most any item a homebrewer would need. I bought three #6.5 rubber stoppers and some new airlocks. Once home, I sanitized one of the stoppers and an airlock and my hands), unscrewed the earlier cap/airlock attempt, and then pushed the stopper firmly into the top of the jug, filled the airlock with sanitizer solution to the marked fill line, and inserted that into the rubber stopper. It was immediatly clear that this was the way to go, as CO2 started venting through the airlock within seconds. Whew! I do believe this batch is saved :)

Here's how the one-gallon batch is looking now:

I feel much better.

Cheers :)