[中 文] 一、用途打撈魚頂變形，尤其對彎扁魚頭的遇卡油管更加有效。二、特點1、具有普通卡瓦撈筒的一切功能。2、具有對變形魚頂整形作用。3、對變形遇卡落物，可先整形在打撈，并可進行反轉倒扣。4、具有可退性。
- [English] It is more effective for fishing the blocked oil pipe with the distorted fish top, especially with flexing flat full head.II. Characteristics 1. It has all functions of common slip overshot.2. It has plastic function for the distorted fish top.3. For the distorted blocked fishing substance, firstly make plastic and then fish, and it can carry out reversal and conversing.4. It is releasable.