It is a 7 size rubber stopper.
Drilled to accept airlock or tubing.
Top diameter: 50 mm, 1.97"
Bottom diameter - 42 mm, 1.65"
Drilled to accept airlock or tubing.
Top diameter: 50 mm, 1.97"
Bottom diameter - 42 mm, 1.65"
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Bungs
Doesn’t slip out! Holds as it should!