Just curious what folks do - I bought some large vinyl type blowback tubes from my local-ish brew supply store for my carboys. One fits sort of snug but not tight, and the other is loose enough for a bit of gap. I would like them both to fit much more tightly.. curious if there's a trick. I suppose I could put them over a beer bottle neck and put some heat on them to force them a bit wider.. any other tricks or techniques? thx, JD
