Specifications: The product automatically vents gas to prevent air from entering the bottle, ensuring that the food does not become moldy. You don't need to open the fermenter every day, just release the excess pressure and keep the water level. It suitable for any 2.76/3.39 inch wide glass jar, cans and fermenters with diameter. The lid can be cleaned quickly and efficiently, also can get cleaning done fast and efficiently on both dishwasher and handwashing. Item Name: Fermenting Lid Material: Silicone, Metal Application: for Making Pickles in Mason Jars, Coffee Cups, and Water Cup, etc Features: Sealed, Wide Mouth, Waterless, Durable Single Lid Diameter: 70mm/2.76", 86mm/3.39" (Approx.) Notes: You will find more amazing products if you visit our store. Due to differences in lighting and screen settings, the color of the project may be slightly different from the picture. Due to different manual measurements,allow for slight size differences. Package Includes: 1 x Fermenting Lid with Steel Ring (Food and Jar Not Included)