I have always just used a fermentation bung and have had no problems.
Tim

"RD" > wrote in message
ups.com...
> This year I'm considering doing my MLF in barrel. In the past, I've
> waiting til MLF completed in glass before transferring to the barrel.
> The trouble is that I'm using 15 gal barrels so I'm having difficulty
> locating suitable bored silicone bungs to hold an airlock. Anyone know
> of a source for these? Would a fermentation bung work ok for this?
> Any opinions on the Ferm-rite bungs? As always, thanks for your help.
>
> RD
>