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Durable and reliable gas sampling bags made from PTFE and aluminum foil for optimal gas collection and storage. Features a user-friendly valve that is easy to operate; simply turn 1/2 circle counterclockwise to open and close securely. Suitable for a wide temperature range from -30°C to 80°C, making it ideal for various laboratory and field applications. Each bag can be inflated to approximately 80% of its nominal capacity, ensuring efficient gas sampling without risk of leakage. Pack of 5 gas sampling bags, perfect for multiple experiments or projects, providing excellent value for your laboratory needs.