1. Easiest Airlock for Mason Jar Fermentation These premium selfopening fermentation lids feature a oneway waterless valve that automatically releases gas when fermenting vegetables at home. This simple onepiece airlock requires no water, burping or maintenance. 2. Foolproof Fermentation Accessories Fermenting vegetables can be tricky without the right canning materials and equipment. High pressure occurs and can blow off the lid or even crack the glass. Open air can ruin the fermentation, so our oneway valve prevents spoilage. 3. Right size and premium material The fermentation lid is made of premium silicone, easy to clean. They are dishwasher safe along with your wide mouth Mason Jar. 4. Space saving Our silicone airlock valve is designed to take up less space, allowing you to conveniently store fermented vegetables in cabinets and drawers. 5. Make probioticrich foods at home Ferment your own sauerkraut, sauerkraut, sauerkraut, and more. You can ferment any vegetable, from cabbage to carrots, cucumbers, tomatoes, garlic, radishes, and more. Get probiotics economically and naturally at home.