Features: Various specifications: one-way fuel-check-valve, four specifications are optional, and one is always suitable for you. Strong and durable: our check-valve is made of high-strength aluminum alloy, which is strong, durable and corrosion-resistant. Oil supply joint hand pump: this check-valve can supply water, diesel-gasoline, with aging and wear resistance. Wide application: this check-valve is generally applicable to the fuel-systems of standard cars, Renault-cars, ships, motorcycles, helicopters and so on. Rust Proof Set: This screwdriver set adopts high quality material which will avoid rust well. Specification: Material: Stainless Steel Gate Specification: 6mm 8mm 10mm 12mm includes: 1 *Check-Valve for 6mm OR 1*Check-Valve for 8mm OR 1 *Check-Valve for 10mm OR 1 *Check-Valve for 12mm