one tubing string is in the tubing hanger the locking pins 38 are now turned inwardly to engage the locking sockets 22 in the tubing hanger as shown in cross section in fig5 and the tubing hanger 18 is now locked in place in the spool 10 subsequently the dogpins 39 which have conical inner ends 46 are turned inwardly so that the conical inner ends 46 engage the bevelled periphery 48 of the energizing ring 26 thereby forcing the ring upwardly the upward movement of the ring 26 compressing the packing ring 24 so that it tightly engages the walls 30 in the upper end of the spool 10 thereby sealing the space below and above the tubing hanger 18 the tubing spool 10 is now setup to accept any of the usual equipment that is required by the end user advantages of the present invention when used in a pressurized well will be appreciated from a review of fig1 12 and 13 fig1 shows the tubing hanger 18 being run on the last joint of the tubing 14 an upper blow out preventer 50 and a lower blow out preventer 52 with an intermediate spool 54 are mounted on top of the tubing spool 10 the upper blow out preventer 50 is opened and the bottom blow out preventer 52 is closed in fig1 the tubing hanger has been lowered through the upper blow out preventer which is now closed and the lower blow out preventer 52 being opened so that the tubing hanger 18 travels down through the spool 10 the packer 16 is then latched and packed off and the sub is now pulled upwardly to set the tension in the tubing and the tubing hanger 18 is seated locked.