what stoppers are used for growlers?

[PUD]

is a no. 6 stopper used for half gallon glass jugs??

 

[NateKerx]

not sure about number 6 but the universal carboy bung fits in there

 

[BarleyWater]

The stopper in my growler doesn't have a number on it, but one of my others that is just slightly too large is a #7, so #6 is probably a good bet.

 

[david_42]

I use carboy bungs. I think they are #6s.

 

[sonetlumiere85]

I use #4s for half gallons and full gallons.

 

[Melana]

I use #6's for gallon jugs and for growlers.