You guys are going to laugh at me for this one but I don't mind feeling stupid sometimes. I ordered an aeriation stone from Midwest. It was supposed to be here Dec x. (can't remember exact date). Anyway, I had all my beer supplies ready, including O2 tank but no stone. It got lost in the mail for over 3 weeks. After a week of waiting, I bought the only thing I could find with a reverse thread for an o2 tank. That was a dual hose for welding. It was meant to connect to mapp gas and o2 for a powerful flame. I just sanitized the whole handle, turned it on and threw it in the bottom of the fermenter (not hooked to mapp gas, just o2) They were some huuge bubbles. I finally got the stone and used it on my newest batch and realized how fine the bubbles are supposed to be. So I guess you can say that I infused it with o2, only not sure how effective it was.