High Quality Material:: This female cap is made of aluminum, the black surface is treated with anodic oxidation, high strength, hardness and durability, corrosion resistance. Reusable and durable. Standard Size:: 4AN is 0.67 inch high, 0.63 inch diameter. 6AN is 0.79 inch high, 0.79 inch diameter. 8AN is 0.98 inch high, 0.87 inch diameter. 10AN is 1.06 inch high, 1.18 inch diameter. Practical Function:: The connector cover can block the fuel line and prevent dirt and debris from entering the connector and adapter. In addition, it can also be used to cover the male thread of AN flare fittings to prevent liquid leakage. Excellent Sealing:: The female flare cap has a strong seal and is ideal for sealing open or unused AN flares to prevent fluid leakage into open areas, reducing fluid waste and making your cleaning and maintenance less labor-intensive. Wide Application:: Our products are widely used in returnless fuel systems, fuel cell tanks, fuel lines, valve covers, etc. The female flare cap is universally used for automotive braided fuel hoses, oil, gas, water, liquid and air lines. Product Description Specifications: Material: Aluminum Color: Black Size: 4AN, 6AN, 8AN, 10AN Weight: 50g Package includes: 2 * Female socket cover Product size: – 4AN: Height: 0.67″ Diameter: 0.63″ Tips: – The product size is measured by hand, please allow a little error, but it does not affect the normal use, thank you for your understanding. – If there are more complex parts and pipes in the application site, it is recommended that professional technicians disassemble and install them.