Featuring streamline shape and filled with lead, the free-fall opening plug can quickly free-fall to the lower sliding sleeve.
重力塞为流线形，内部装有铅，投塞后快速自由下落至下滑套上并形成密封。
Featuring streamline shape and filled with lead, the free-fall opening plug can quickly free-fall to the lower sliding sleeve.
重力塞为流线形，内部装有铅，投塞后快速自由下落至下滑套上并形成密封。
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