assembly in either direction through the tubing string 10 the selector stop means 24 cooperates with a selected stop nipple 20 to limit the movement of the running assembly in one direction through the tubing string 10 the stopping of the running assembly by the cooperation of selector stop means 24 and the selected stop nipple 20 positively locates the running assembly with respect to the selected mandrel 14 the illustrated selector stop means 24 and nipple 20 are the same as those shown in the aforesaid u s patent to miller different key configurations and mating nipples permit the stop means to land in selected nipples note that the recesses in nipple 20 and 20a are different lengths and a key designed to fit nipple 20a will not fit nipple 20 the illustrated operating tool means 26 is a kickover tool means the kickover tool means 26 is identical to the kickover tool disclosed in u s pat no 3 837 398 to john h yonker the entire disclosure of which is hereby incorporated by reference the kickover tool means operates in the manner described in the aforesaid patent to install or retrieve equipment from the side pocket receptacle 18 of side pocket mandrels 14 means are provided for connecting together the operating tool means 26 and the selector stop means 24 the connecting means spaces the operating tool means 26 a sufficient distance from the selector stop means 24 so that the selector stop means 24 is disengaged from the selected stop nipple 20 when the operating tool means 26 is in a position to coact with the selected mandrel 14 to effect operation of the.