Check and replace the O-ring of the piston head.
检查和更换活塞头的O型圈。
The seal head adopts a conic piston or a ball to meet the need.
根据需要，密封头采用锥形活塞或球体。
Avoid put hands or head into the feed port when the piston rod is running.
活塞杆运行时严禁向送料口伸入头手或送料。
The top part of the piston is the head, or crown.
帽子中盖住头顶的部分。
The top part of the piston is the head, or crown.
帽子中盖住头顶的部分。
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