【FDA Transparent Upgrade Airlock】Compared with other airlocks for fermenting, it is stronger, more transparent, and made of food-grade materials. You can easily see the entire fermentation process, they can last for a long time, because they are the top FDA transparent airlock! | 【Multifunctional use】 The air lock can be used for various fermentation projects to preserve food. As a brewing airlock, craft beer, wine, sauerkraut, kimchi, cider, fruit wine, rice wine, broccoli, carrot and ginger, and kimchi are brewed | 【Package content】 4 fermentation airlocks, size: height 6.7 in/17 cm. 4 No. 6 fermentation stoppers, size: top diameter 1.3 in/3.3 cm, bottom diameter 0.98 in/2.5 cm, Height is 1in/2.6cm. 8 airlock grommets, size: inner ring diameter is 0.39 in/1 cm, outer ring diameter is 0.59 in/1.5 cm, the quantity is sufficient, As a spare, the price is right | 【Good airtightness】 The good airtightness of the fermentation airlock makes fermentation easier, effectively isolates the air and prevents oxidation. Automatic exhaust at room temperature without manual control | 【High-quality after-sales service】 We have carefully checked each air brake. If there is any problem that makes you unsatisfied, please feel free to contact us. We will unconditionally give you a full refund or free replacement