A Complete Brewing Airlock Kit Get a long-lasting fermenting solution that offers great value. This kit includes 6 bubble airlocks, 6 #6 stoppers, and 12 grommets. Drill a 3/8-inch hole for grommets or a 1-inch to 1.28-inch hole for stoppers on the lid.High-Transparency Bubble Airlock Unlike standard S-shaped airlocks, this fermentation airlock is made from durable, high-quality material that is more rigid and highly transparent, allowing clear visibility of the entire fermentation process. Apply gentle pressure when inserting into drilled stoppers for a secure, long-lasting fit.Improved Dust Cap Design Features a textured surface with a zigzag pattern to prevent slipping when opened. Includes 3 internal buckles for easy snap closure. Simply press down to close and pull up to rotate open. The cap allows gas to escape without requiring additional drilling.Reusable & Versatile These bubble airlock sets are sturdy and reusable for multiple brewing cycles. Ideal for fermenting beer, kombucha, peppers, watermelon, salsa, and other fermented beverages. Provides an economical, oxygen-free environment for fermentation.Color: As shown in photo Material: Plastic Package Contents: 6 sets x Twin Bubble Airlock Note: Light reflection and display settings may cause slight color variations. Measurement tolerance: 13 cm. Only the listed items are included; other accessories are not part of the package.