This hands-free hydraulic piston guide is used to assist in the removal and replacement of hydraulic pistons - no more “chasing” pistons up the elevator shaft. Simply attach the guide to the piston and adjust the connecting arms out to the rails. The centering guide will keep the piston in proper position for lowering into the jack casing. After the new casing and piston are installed, this tool will guide the piston up for easy re-attachment to the bolster channel.