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 provides everything needed for effective fermentation monitoring. Improved High-Transparency Bubble Airlock Made from high-quality, food-safe plastic, this airlock is more durable and significantly clearer than standard S-shaped models, allowing clear visibility of the fermentation process. Insert into a drilled hole (3/8 inch for grommets or 1 inch to 1.28 inches for stoppers) with gentle pressure for a secure, long-lasting fit. Enhanced Cap Design Features a textured zigzag surface for easy handling and three internal locking tabs that allow the cap to snap securely closed. The cap opens by lifting and rotating, and its vented design allows gas release without requiring additional drilling. Reusable and Versatile Constructed for repeated use, this set is ideal for fermenting beer, kombucha, peppers, watermelon, salsa, and other fermented beverages. Provides an oxygen-free environment to support consistent, contamination-free 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.