The Xs RU (retrievable/reusable) system is used with any size casing that needs to be retrieved from the ground. The crown O.D. is slightly bigger than the O.D. of the casing and is butt welded to reduce drag when pulling the casing.
This is why the Xs RU has a limited pass through diameter compared to our other socket type systems. The Xs RU has the same design as the Xs T V2.0 system with all its benefits

More about Xs RU System