Features: Make of Aluminum alloy, which is light, strong, and wear resistant, and long terms use. Line Checks Valves are simple in designs, easy to operate, require none complicated steps, are convenient, and fast. Inline Nonreturn Valves are suitable for systems products such as automobiles, motorcycles, and ships. Single Way Checks valves is use to prevent from flows back to tanks and maintain the normal use of the systems. Small in size, easy to carry and store, and are a practical car and ship accessory. Specifications: Component: Aluminum Alloy Type: 6mm/8mm/10mm/12mm/14mm/16mm Size: As Shown in the Picture Package Includes: 1pc Line Check Valves note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.