A Complete Brewing Airlock Kit – This kit includes 6 bubble airlocks, 6 #6 stoppers, and 12 grommets for long-term use. Designed for durability and clarity, these components are ideal for fermentation applications. 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, non-fragile material with improved transparency for clear monitoring of the fermentation process. Apply pressure slowly when inserting into the drilled stopper to ensure longevity. Top-quality construction supports repeated use in wine, beer, and beverage brewing. Improved Cap Design – Features a textured surface with a zigzag pattern to prevent slipping when opening. Includes three internal buckles for secure closure with a snap. The cap can be gently pressed to close and rotated to open. Venting space around the lid allows gas to escape without requiring additional drilling. Reusable & Versatile Application – These bubble airlock sets are sturdy and reusable, suitable for multiple fermentation cycles. Ideal for fermenting beer, kombucha, peppers, watermelon, salsa, and other beverages. Provides an economical and oxygen-free environment for fermented items. 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 variation between the image and the actual item. Measurement may vary by +/- 1-3 cm.