Specifications: Suitable for water, petrol, diesel, oils, and other fluids(do not apply to alcohol, because electricity will produce methanol, formic acid, a corrosive effect on the inside of the product, it will lead to product failure) Professional grade non-return valve Easy to install, prevents fuel from siphoning back into tank Stable performance and high reliability The life of Aluminum head for using is longer than plastic heads Arrow marked on valve, showing fluid flow direction, prevent fuel from returning back to the tank and keeps it in the line. Material: Aluminum Package Included: 3pcs* 10mm 3/8" Check Valve Note:Please make sure that the part number and the item picture fit for your car before purchase.