Function Prevents fuel from siphoning into the tank and retains it in the line. Material Made of aluminum alloy material, anti-rust, lightweight and durable. Dimensions 6mm, 8mm, 10mm, 12mm. A variety of sizes for a variety of occasions. Compatibility Compatible with gasoline, diesel, vegetable / organic oil, paraffin / kerosene oil, etc. Application Suitable for low pressure carburetor and fuel systems. Cars, boats, helicopters, motorcycles, etc. Product description - Made of aluminum alloy, anti-rust, lightweight and durable- 6 mm 8 mm 10 mm 12 mm, 4 sizes to choose from- Prevent fuel from returning to the tank and keep it in the pipeline- Compatible with gasoline, diesel, vegetable / organic oil, paraffin / kerosene oil, etc.Caution: Not suitable for methanol, as methanol will generate formic acid when under tension, which has a corrosive effect inside the product.SpecificationExternal material: Aluminum alloyInternal material: NBR rubberColor: SilverSize: 6MM 8MM 10MM 12MMOpening pressure: 0.2 barWorking pressure range: 0.2-6 barOperating temperature: - 30 - 130 Package included1 x Diesel check valve (6mm)1 x Diesel check valve (8mm)1 x Diesel check valve (10mm)1 x Diesel check valve (12mm)