... M75*2 Hydraulic Cylinder Piston Parts Details: 1). Piston parts are used in hydraulic cylinder, auto car, racing car, farm machinery, ... machinery, transportation parts and so on.2). All seals are manufactured to US specification.3). Piston Finish: Fe/Zn ... etc. 3. Quality Certificates: ISO9001-2000, ISO9001-2008 Quality Assurance System, the USA UL. 4. Products covering hydraulic cylinders, pistons, ...