Bung that closes with precision.
measures
Bung with higher adaptability.
Bung with flange on top.
Bung with fermentation valve.
Bung with expansion system.
Bung with the 2017 mark.
Bung with relief on top.
Bung with vertical hole.
Small bung for racking.
Colors, shapes, measures, etc...
Fermentation-Rotation-Mechanism.