This product is a one-way valve sticker for fermented food that releases fermented gas such as coffee, manufactured by Maruten Sangyo Co., Ltd.

It helps to release the gas generated in the product’s package and prevent the air from the outside to goes into the product.

"Coffee beans & more"

The product allows carbon dioxide gas generated from coffee to pass through the package in order to preserve the rich and full flavor of fresh coffee.

"Keep the aroma"

Carbon dioxide oxidation is the cause of processed food spoilage. Therefore, TASTE KEEP VALVE was developed to maintain the quality and aroma of coffee.