Bored Bung 18-24mm
Bored Bung 22-24mm
A Bored Rubber Bung! With a 9mm hole in it.. Perfect for an airlock really.
Has a thin skin of rubber over the 9mm hole, easily pierced with a well maneuvred knife.
Top Diameter: 24mm
Bottom Diameter: 22mm
Margin: +/- 1mm