50Pcs/Set One-way Degassing PE Valve With Filter Exhaust Ventilation Vent Coffee Bean Storage Bag Coffee Bag Exhaust Valves Features: *50Pcs -way Degassing PE Valve With Filter Exhaust Ventilation Vent Coffee Bag * new and high quality *Made of high quality material, and practical to use *In its most common application, the valve is used to release, from a container, gas emitted by a product (such as roasted coffee) while air from entering the container and coming in contacting with the product itself *With unique filter screen, which can isolate the effect of powder on the valve exhaust, while making the product more sealed *It can well block oxygen from entering the packaging bag, and can smoothly discharge carbon dioxide, and the amount of oxygen entering the exhaust valve is less than 1% * -way degassing valve, -way exhausting, only exhaust and no intake *Highly sensitive *Can also be used in food bags, packaging bags, pet food bags, etc. Specifications: *Oxygen content in the bag during coffee storage: