Material】Made of aluminum alloy, rust-proof, lightweight and durable. 【Function】Prevents fuel from flowing back into the tank and retains it in the line. 【Dimensions】6mm, 8mm, 10mm, 12mm. Different sizes for various occasions. 【Compatibility】Compatible with gasoline, diesel, vegetable/bio oil, paraffin/kerosene oil, etc. 【Application】Suitable for carburetors and low-pressure fuel systems. Cars, boats, helicopters, motorcycles, etc. Features - Made of aluminum alloy, rust-proof, lightweight and durable - 6mm, 8mm, 10mm, 12mm, 4 sizes for you to choose - Prevents fuel from flowing back into the tank and keeps it in the pipeline - Compatible with gasoline, diesel, vegetable/bio oil, paraffin/kerosene oil, etc. Caution: Not suitable for methanol fuel, as methanol generates formic acid when energized, which has a corrosive effect on the inside of the product. Specifications External Material: Aluminum Alloy Internal Material: NBR Rubber Color: Silver Size: 6MM, 8MM, 10MM, 12MM Opening