A Complete Brewing Airlock Kit – This kit includes 6 bubble airlocks, 6 #6 stoppers, and 12 grommets for long-lasting use. Designed for durability and convenience, it offers a reliable solution for fermentation needs. 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 – Made from high-quality, durable plastic, this airlock is more rigid and transparent than standard S-shaped models, allowing clear visibility of the fermentation process. Apply gentle pressure when inserting into the drilled stopper to ensure a secure fit and extended lifespan. Improved Dust Cap Design – Features a zigzag surface pattern to prevent slipping when open. The cap includes three internal buckles for a secure snap closure. Simply press down to close and pull up to rotate open. The design allows gas to escape without requiring additional drilling in the lid. Reusable and Versatile – These bubble airlock sets are sturdy and reusable, suitable for multiple brewing cycles. Ideal for fermenting beer, kombucha, peppers, watermelon, salsa, and other fermented beverages. Provides an economical and 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 differences may cause slight color variations. Measurement tolerance: ±1–3 cm. Only the listed items are included; other products are not part of the package.