Function: This valve prevents fuel from flowing back into the tank and keeps the line open. Material: Made of aluminum alloy, rust-proof, lightweight and durable. Size: 6mm, 8mm, 10mm, 12mm. A variety of sizes for various occasions. Fitment: Suitable for carburetors and low pressure fuel systems. For use with gasoline, diesel, vegetable/vegetable oil, paraffin/kerosene oil, etc. Widely used: Aluminum one-way valves can be used in carburetors and low pressure fuel systems, and are widely used in automobiles, ships, caravans, helicopters, ships, motorcycles, etc.