The Z Lock Mandrel is designed to secure subsurface controls within BR Profile Nipples. Crafted with an external fishing neck, this mandrel features a robust assembly comprising a Lock Mandrel, two Locks, and Lock Springs. Its seamless integration with subsurface control accessories ensures reliable functionality within the specified seating nipple. Two upward facing locks stop upward movement of assembly. Downward travel is stopped by the packing mandrel landing on the No-Go of the BR Profile Nipple.