LT-T型可退式卡瓦打捞筒是抓捞井内光滑外径落鱼最有效的工具，能高泵压循环，也可以井内释放落鱼。根据用途的不同配有加长节、 壁钩、 加大引鞋等附件。

Model "LT-T" Releasing and Circulating Overshot is an external fishing tool used for catch the fish with smooth external surface. Its circulation can be carried out under high pump pressue and the fish can be released on the inside of well. According to different uses, it may be equipped with some accessories, such as extension sub, wall hook, enlarged guide, etc