General description The fermentation airlock is designed for high-quality fermentation processes. Made from food-grade polypropylene and rubber, it is ideal for wine making, beer brewing, and fermenting foods like sauerkraut. This airlock effectively isolates air to prevent oxidation, allowing for automatic fermentation at normal temperatures without manual intervention. Technical specifications Stopper dimensions: 17 x 23 x 26 mm Check valve dimensions: 17 x 1 cm Material: Food-grade polypropylene and rubber Color: Clear Package Contents 4 Check valves 4 Stoppers Other information Measurement allowed error: +/- 1-3 cm Note: Light and different displays may cause the color of the item in the picture to differ slightly from the actual product.