The ‘RD’ Internal Seal Sub is used with innerstring circulation strings when running slotted Liners or Sand Screens and the need for circulating them into place with Liner top system and running tool. The sub is normally ran just above a circulation valve or float shoe. And requires an ‘S’ Slick Joint to be ran in conjunction with it. The ‘RD’ Internal seal Sub is designed for thermal application and for easy release when used with Short light liner screen systems on all running tool designs.

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