FDA Highly Transparent Airlocks - Made of a healthy material that is harder and more transparent than typical S-shaped airlocks, allowing you to clearly see the entire fermentation process. - Press-fit into drilled plugs/stoppers and designed for long-lasting use as a high quality clear airlock. Good air tightness - Provides a strong airtight seal to facilitate fermentation and prevent oxidation. - Automatic exhaust at room temperature without manual control. Easy to put on and take off - Dust cap features a zigzag surface for a non-slip grip. - Internal 3 buckles; gently press to close with a push button, pull up and turn to open. - Lid does not need to be drilled; there is a gap around it through which gas can escape. Reusable and multi purpose - Solid and reusable; built to last and can be disinfected for repeated use. - Suitable for a variety of fermentation projects to preserve food, craft beer, wine, sauerkraut, kimchi, cider, rice wine, broccoli, carrots, and ginger. Use scenarios - Kimchi fermentation: use with standard drilled plugs/stoppers to maintain an anaerobic environment while gases vent automatically. - Kombucha and wine brewing: easy monitoring and venting without manual intervention. - Sauerkraut and other vegetable ferments: helps prevent oxidation and supports predictable fermentation outcomes.