torque therethrough if desired and the transmission of torque is for any reason not important the torque sleeve 28 can engage the liner 91 in such a manner that the castellations 90 and 94 are in alignment as opposed to the offset in which they are shown in fig9 engagement can still occur between the apparatus a and the liner 91 with the castellations 90 and 94 in alignment however upon application of any torque the castellations 90 and 94 will snap into an interengaging orientation as shown in fig9 while a ball 120 dropping against a seat 122 has been shown as the mechanism to obstruct the central bore 52 other ways to close off this bore or to build up hydraulic pressure can be employed without departing from the spirit of the invention those skilled in the art will now appreciate that with the components and movements described above an apparatus a is revealed which can engage a liner and retain the engagement regardless of whether the running tool is subjected to a pulling or a pushing force with respect to the liner additionally torque can be transmitted to the liner 91 outside the locking mechanism or the collet heads 74 the torque sleeve 28 transmits the torque directly from the top sub 10 to the liner 91 a provision is made for relative movement between torque sleeve 28 and top sub 10 which is smaller than the length of the groove in the liner 91 which is to be engaged therefore regardless of whether the collet heads 74 are in tension or compression as shown in fig3 and 4 respectively the engagement is retained the fluid pressure release once accomplished becomes permanent as the torque sleeve 28 is repositioned by the force of spring 32 downwardly.