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Features: This fermentation air exhaust valve can help to release the air inside a brewing barrel. You can use it to isolate air and makes the barrel interal environment fits for fermentation. It can release air smoothly and slowly, the a one-way valve design makes the air won’t flow back. Made of plastic, it is not easy to break nor to crack, is healthy, non-toxic and convenient to be cleaned. The one-way exhaust valve is compact, won’t take much space, easy to carry or store. Specifications: Material: Plastic Color: White Size: 11cm Package contains: 1pc Note: Please allow slight dimension difference due to different manual measurement. Please note that slight color difference should be acceptable due to the light and screen. The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.