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Piston assembly is the expendable parts at the drilling pump hydraulic system,and its one of the biggest wearing parts of drilling work.The piston core is made of 42CrMo. piston rubber is also called the piston cup, its the expendable parts at the drilling pump hydraulic system, and its one of the biggest wearing parts of drilling work.The piston rubber is made of rubber vulcanization.The material of ordinary piston rubber is NBR. Meanwhile, we also provide below spare parts.1Liner: 6 1/2", 7", 140mm, 150mm,160mm, 170mm, 200mm, 230mm 2Piston: 6 1/2", 7", 140, 150, 170, 2303Valve assenbly: valv