Easy to use: Simply install a perforated rubber stopper on the top of the fermentation stopper container, insert the fermentation stopper device into the rubber stopper, pour water into the stoppered fermentation frother, and then cover the lid to ferment red wine. One way valve design: The fermentation frother with a plug is designed to isolate the air in the well during the secondary fermentation process, avoid oxidation, and allow the entire fermentation process to be automatically carried out and discharged at room temperature without the need for manual control. Our fermentation bubbler group is widely used, and is very suitable for food preservation, cabbage, pickle and pickled Chinese cabbage fermentation, as well as brewing wine, beer, sake, etc. Reusable fermentation stoppers do not require manual control and are easy to clean, which is very useful for red wine fermentation. Made of safe and non-toxic plastic and silicone. Features: Product Name: Fermentation Bubbler Materials: Food grade silicone and high-quality plastic size Fermentation frother with stopper: 170 * 10 mm/6.69 * 0.39 inches Color: White Packaging content: 3PCS x fermentation frother