I put a beer on tap awhile back. When I would go to tap a beer on that faucet, I would get air (CO2 I guess), then a lot of foam, then beer. It was new and it would happen over and over. It happened with the entire keg until I emptied it last night. I put a keg of helles in its place and the pour is acting normal. So it's the keg, I assume and I'm pointing to the o-ring on the liquid out post. I looked at it last night but I did not inspect it closely. I assume it has a nick in it or something and the seal was dodgy and it allowed some air to be pulled into the pour and also allowed for the beer to "fall" into the line so that every time I tapped a beer there was CO2 and foam. What's weird is that the beer tasted fine, did not seem oxidized and you might also wonder if my CO2 tank would've been emptied quickly if that was the case but the answer is NO. With the new keg pouring properly I have to assume it was the keg. Thoughts?