WUZHOU Material: The fermentation airlock is made of high quality food-safe plastic, reusable and easy to clean.<br> Feature: All fermentation processes are automatic fermentation and exhaust at room temperature, without manual control, easy to use, simple to operate, and can be used repeatedly for a long time.<br> Easy to Use: ust install the silicone stopper/ silicone grommets on the appropriate cap, then insert the fermentation airlock, pour the water into the airlock, and close the lid.<br> Application: Suitanle for wine making, sauerkraut, sealing, fermentation, grape juice and so on.<br> Delivery Quantity: 4pcs<br> Package Contents: Only the above package contents, excluding other products.<br> Size: 13*5cm<br> (Reminder: The size is measured manually, please allow 1-2 cm measurement error)<br> color: White<br> (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)