The Haul Conversion Kit for the FSO Roof Ops Kit consists of a Petzl Rescucender Rope Grab, A Petzl RollClip A Carabiner/Pulley, and a Petzl Captiv to hold them together as a pair.  This simple equipment allows the operator to transition from a lower to raise with theortical 3x1 Mechanical Advantage Z Rig haul system.