?Product Size?:6mm 8mm fuel primer pump petrol. ?Features:Fuel primer bulb suitable for vehicles without ESP start-up,; using 1 or 2 tank systems to transport vegetable oil, natural gas, and gasoline.; ;with a one way valve installed to help quickly prime the fuel system. ?Materials?:Hand vacuum pump made of high quality rubber and aluminum.has the metal ends and works well. Vacuum hand pump long life with high temperature and durable materials,high reliability. ?Application?:Primer bulb marine effective tool for priming engines on cars, motorcycles and boats. ?Service?:Please feel free to contact us if you have any problems about the products.