a flow orifice 106 is provided in upper mandrel 24 flow orifice 106 is sized and positioned to allow flow of fluid from passage 48 into annular opening 104 connector 52 comprises connector flange 111 connector flange 111 sealingly engages lower housing 102 piston head 94 sealingly engages lower housing 102 accordingly fluid transmitted from passage 48 into annular opening 104 is retained intermediate connector flange 111 and piston head 94 anchor 10 components are sized and structured such that fluid flow into annular opening 104 first fills annular opening 104 with fluid not shown then biases piston head 94 upward toward body 40 as cylinder 32 and cylinder cap 38 are each slidable on upper mandrel 26 continued injection of fluid into annular opening 104 pushes all of piston 30 cylinder 32 and cylinder cap 38 upward toward body 40 such force causes slips 28 to extend outwardly interaction of inclined slip upper guide surface 64 with body guide surface 84 facilitates outward movement of slip 28 at slip 28 upper end 70 interaction of inclined slip lower guide surface 66 with each cylinder cap inclined surface 90 facilitates outward movement of each slip 28 at the slip lower end in some embodiments the outward extension of slips 28 occurs without rotating the slips 28 relative to the central axis 100 when sufficient fluid is introduced into annular opening 104 slips 28 will be extended until exterior surfaces 60 of slips 28 engage casing wall 58 or portions of an uncased bore anchor 10 will be set in a.