Features: Suitable for all sizes of check valves, check valves, check valves, oil supply valves, oil pumps, hand pumps and aluminum gaskets. Fits all sizes of oil supply fittings and hand pumps. Use medium: diesel, gasoline, water, etc. (Not suitable for methanol, because methanol will generate formic acid when energized, which will corrode the inside of the product and cause the product to fail). Scope of application: For ships, helicopters, ships, motorcycles and other fuel systems. Advantages: Diesel resistance, gasoline resistance, aging resistance. Package Includes: 1 x Check Valve Specifications: Material:Aluminum Alloy Length: Approx.6.1cm/2.4inch Specification: 6mm/0.24", 8mm/0.31", 10mm/0.39", 12mm/0.47" Color: Silver Opening pressure: 0.2 bar Working pressure range: 0.2-6 bar Working temperature range: -30 -130 note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.