Ball-lock steel carbonation cap

FermZilla Ball-lock Stainless Steel Carbonation and Line Cleaning Cap.

The thread is suitable for 1 and 2L PET bottles, so the bottle can be turned into a convenient travel drink.
The ball lock is compatible with gas and beverage connections
Fermenting with FermZilla? This is the same Ball-lock connector that comes with the FermZilla Pressure Kit and is also compatible with the FermZilla Yeast Collection Container.