The Rebco ROTZ-1 and ROTZ-2 are Bottom No-Go, Non-Flowing Lock Mandrel Sub-Assemblies that cover nominal tubing sizes from 1.660" to 4.50". The assembly's upward-facing Dogs resist upward movement, while the No-Go function is provided by the shoulder machined into the attached accessory rather than by the lock body itself. As a result, the ROTZ can only be used with a Bottom No-Go type nipple, where the accessory's No-Go shoulder seats against the nipple's lower profile to prevent the lock from travelling further downward.

The ROTZ-2 is used across most of the size range, with the ROTZ-1 appearing at the 1.660" and 4.50" nominal sizes. This bottom-referenced positioning design suits applications where the depth-control anchor point is below the lock, rather than above, as in the Top No-Go ROTW configuration. All ROTZ sub-assemblies are available in a variety of materials suitable for downhole conditions, and the required running and Pulling Tools with Probes are specified in the engineering data for each size and accessory type.

How to Order: Product Code 10. Specify nominal tubing size, seal bore size, lock type (ROTZ-1 or ROTZ-2, as appropriate), material, service conditions, and the accessory type to support correct selection of running and pulling tools. Note that the ROTZ is compatible with Bottom No-Go type nipples only.