Originally Posted by peter78
I use a 6.5 gal carboy and a 1" diameter blow off tube for the first week. It hasn't been necessary till my last batch-a hefeweizen-it went all the way through the tube to the other end dipped in star san.
That's a glass carboy. The better bottle neck is much wider then that. I learned this the hardway buying a 1" tube because so many people do this, then getting home and realizing it doesn't fit the better bottle that the OP has.
First Brew was thanksgiving 2011, I'm at 84 batches and counting (as of 7/09/2014), and ran out of room in my signature to list them all.