The Glass Fermentation Jar features an Automatic Air Valve Design for gas discharge, Time Recorder, and Double Seal for safe and healthy storage and fermenting of food. Minimizes Rot and Extend the freshness of things. Applicable for fermenting various foodstuffs. Available in 500ml, 750ml, 1000ml, 1500ml sizes. Features: 1. Automatic Air Valve Design: The gas generated during fermentation can be automatically discharged, effectively avoiding extreme situations such as tank expansion. 2. Time Recorder: There is a time recorder on the lid, to keep track of batches, No more needing to remember when that batch started. 3. Minimizes Chances of Rot: Silicone double seal, no air leakage, no water leakage, it is very hard for contaminates to grow in a vacuum, increasing your chances for success. Extend the freshness and shelf life of things 4. Safe Glass Material: The glass fermentation jar is made with healthy glass, a perfect choice for storage and fermenting food, to ensure the best environment for fermenting vegetables, no dust or chemicals leach into the food anymore. 5. Applicable: Perfect for fermenting sauerkraut, wine, fruit, and any other fermented vegetables or foodstuffs you might fancy, easy to use, and easy to clean. Specification: Material: Glass Color: Blue Capacity: 500ml, 750ml, 1000ml, 1500ml Product Size: 10.7 x 11cm, 14.2 x 11cm, 17.2 x 11cm, 22 x 11.5cm Product Weight: 550g, 650g, 800g, 900g Package Included: 1 x Fermentation Jar