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.