Bidule

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The bidule is a cylindrical plastic potty that is used as an insert in the mouth of a champagne bottle to increase the tightness of the crown cap used as a closure during fermentation and storage time of a bottle of sparkling wine.

The bidule also makes it easier to remove the yeast when disgorging after fermentation. The name comes from French and means in the literal translation "Dingsda". The use of the bidule has an influence on the quality of the sparkling wine, as the gas exchange in the bottle cap is reduced and oxidation processes in the sparkling wine are slowed down. The bidule is mainly used in champagne and cremant production in France. German sparkling wine manufacturers often work with a bidule-like plastic insert integrated into the crown cap.