Features: 1. Versatile Fermentation Use – Ideal for winemaking, beer brewing, fermenting sauerkraut, and other daily fermentation projects. 2. Easy to Assemble – Simply press the stopper onto the carboy, insert the airlock, add water, and cover with the lid to complete setup. 3. Effective Gas Exchange – Isolates air to prevent oxidation while allowing CO₂ to escape, enabling automatic fermentation at room temperature without manual intervention. 4. Durable & Reusable – Made of transparent, food‑safe plastic for clear monitoring and long‑term use. 5. Hygiene‑Ready – Can be sterilized with boiling water before each use for safe, contamination‑free fermentation. Product Details: This S‑type brewing airlock ensures a controlled anaerobic environment, promoting consistent fermentation while preventing external contaminants. Its simple, tool‑free design allows quick installation and easy cleaning. Suitable for carboys, fermenting buckets, and mason jars, it is an essential accessory for home brewers and fermentation enthusiasts. Specifications: - Size: 20 x 2 cm - Material: Food‑grade plastic - Color: Transparent - Package Contents: 12 x Winemaking Check Valves (Airlocks) Only the listed items are included. Slight color variations may occur due to lighting and screen differences. Measurement tolerance: ±1‑3 cm.