50mm Rubber Cap With Hole

?Chamber style Airlock? type fermentation trap fits bored rubber/cork bung. Half fill with water and when fitted protects the ferment by allowing a visual passing of gas pressure to escape but admits no air.

?Chamber style Airlock? type fermentation trap fits bored rubber/cork bung. Half fill with water and when fitted protects the ferment by allowing a visual passing of gas pressure to escape but admits no air.