spaced relationship about the male member with the cutouts terminating at 54 to thereby form a series of longitudinally aligned radially spaced upwardly opening grooves which define the before mentioned fingers a releasing member 64 preferably includes an upper conical surface which downwardly converges into a central passageway the passageway is of constant i d and terminates at the lower end 68 thereof the large o d portion 70 has a circumferentially extending groove 72 circumferentially formed therein for receiving the illustrated seal therewithin shoulder 74 of the releasing member is formed between the large o d 70 and small o d 77 of the member the shoulder is received in seated relationship against the upper terminal end 60 of the fingers in the illustrated manner of fig3 and 4 surface 80 of the conical portion of the releasing member is arranged whereby there is no likelihood of inadvertent engagement with tool strings which may be lowered down through the releasing member in operation the apparatus of the present invention is preferably arranged in the manner of fig2 and 4 although it would be possible to use the releasing member in the inverted configuration when inverted the configuration of the.