fluid passageway 623 between the inner diameter of outer stinger 614 and the outer diameter of inner stinger 616 the upper end portion of inner stinger 616 is surrounded by the lower end of middle connector 602 and a conventional o ring may provide a seal therebetween the lower portion of bottom connector 606 preferably surrounds outer stinger 614 and is spaced therefrom by means such as a spider 624 which may be integral with stinger 614 the spacing provides for an inflation fluid passageway 626 between the inner diameter of bottom connector 606 and the outer diameter of outer stinger 614 a collar 628 may be formed on the outer diameter of outer stinger 614 near the upper end thereof when the bottom connector 606 is connected to middle connector 602 the upper face of shoulder 610 on collar 608 of bottom connector 606 will bear against the lower face of collar 628 on the outer stinger 614 this forces outer stinger 614 and in turn inner stinger 616 upwardly until the upper face of collar 618 of inner stinger 616 abuts shoulder 620 on middle connector 602 the upper end of by pass fluid passageway 623 preferably terminates in slots 629 formed in.