A piston ring is a split ring that fits into a groove on the outer diameter of a piston in a reciprocating engine such as an internal combustion engine or steam engine. The three main functions of piston rings in reciprocating engines are: 1.Sealing the combustion/expansion chamber. 2.Supporting heat transfer from the piston to the cylinder wall. 3.Regulating engine oil consumption Jinan Leader Trading Co Ltd is specialized in export trucks spare parts, which made in China. We mainly deal with VOLVO and Mercedes Benz series trucks spare parts, including tractor trucks parts, dump trucks parts, concrete mixer trucks parts and other accessories. We provide more competitive price,most efficient and satisfactory service. If you are interested in our prioduct,please feel free to contact us ,e-mail,telephone,whatever,welcome.