InstructionsInstructions: Install the exhaust valve with water and insert it into the infusion cylinder head, or onto the rubber or silicone plug on the top of the fermentation tank, and cover the small cap with a hole on the one-way valve. The bubbles generated during the wine fermentation process are discharged from the barrel through the exhaust valve, allowing for observation of the fermentation state of the wine in the brewing barrel. If you have any questions, please feel free to contact us via email and we will reply to you within 24 hours< CharacteristicsAirlock wine fermentation- Color: Transparent< Br/>- Material: Plastic< Br/>- Size: 17cm/6. 6 inches. Features:The length and width of the fermentation chamber are 170mm and 10mm, respectively. Suitable for holes of approximately 10 mm. The packaging includes10 * wine fermentation airbags