How to identify the quality of the plunger assembly? First, look at the flatness of the sliding shoe surface. The better the flatness, the greater the pressure. You can see that our sliding shoes are very flat. Secondly, look at the fit between the sliding shoe and the plunger head. , Thirdly, when we see that the sliding shoe will rotate when the plunger rotates, such a plunger assembly is very excellent.