an upper spring 26 a lower collet 28 compensating piston 14 and actuator piston 16 compensating piston 14 and actuator piston 16 are disposed in chambers 30 and 32 respectively within housing 18 chamber 32 is in fluid communication with an interior 34 of a tubing not shown via a lower port 36 and chamber 30 is in fluid communication with the interior of a tool body 38 only a representative portion of which is shown via an upper port 40 housing 18 also has a balance port 42 on the lower end of housing 18 to allow fluid communication between the interior of tool body 38 and tubing interior 34 inner sleeve 12 carries a seal 43 on its lower end that seals against the inner wall of housing 18 actuator piston 16 releasably engages housing 18 with lower collet 28 a shifting element 46 is slidably mounted to housing 18 and moves within a slot therein in response to the movement of actuator piston 16 shifting element 46 engages a moveable assembly 48 that is part of tool body 38 moveable assembly 48 has a recess 50 terminated on its lower end by a shoulder 52 shifting element 46 moves within recess 50 causing moveable assembly 48 to move down when shifting element 46 bears on shoulder 52 a lower spring 54 is carried in the lower.