Cassette Air Tank Valve Direct Connection Integrated Gas Stove Refill Adapter Gas Canister Refillable Connector Camping Supplies. Practicality: Integrated butane filling valve adapter for the butane tank on your stove, which is more convenient to use, very efficient and practical. Adjustable Control Valve: On/off switch can adjust the gas refilling speed. Good Quality Material: Made of high-quality copper, zinc alloy, iron with the features of strong, anti-rust, sturdy and has a long using life. Inflation Capacity: The inflation capacity of the cassette gas bottle is generally recommended to be within 180 grams.