There are more than 100 kinds of plunger products of YS, which can match the fuel injection pumps of various vehicles and mechanical equipment for global customers. The YS plunger has high precision and can generate low-pressure fuel into high-pressure fuel within the specified time, while ensuring the flexibility of the plunger during work. The reciprocating movement of the plunger in the plunger sleeve forms the function of the injection pump to suck oil and pump oil.