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In its most common application, the valve is used to release, from a container, gas emitted by a product (such as roasted coffee) while preventing air from entering the container and coming in contact with the product itself. Besides, it used in food bags, medical devical packaging bags, pet food bags. etc.. Material: PE Size: app.2x1.7x0.6cm/0.79x0.67x0.24in Color: White Quantity: 10 Pcs