60 a from fig4 it can be seen that the area on the upper base 56 subject to ambient pressure is found by determining the total upper surface area of the female portion 44 shown having diameter d 2 and subtracting the upper poppet head 51 area shown having diameter d 1 similarly the upward force on the bellows 60 a from ambient pressure is found by subtracting the area where the bellows 60 a connects with the lower base 58 shown having diameter d 3 from the total upper surface area accordingly as long as d 1 exceeds d 3 the force resulting from applied pressure will have a resultant in an upward direction thereby maintaining the pressure seal between the upper poppet 51 and upper base 56 this remains true even if the external hydrostatic pressure compresses the bellows 60 a so the poppet 48 lower head 52 abuts the cavity 46 base which prevents further compression in one example of operation a hydraulic connection is made between two members used in subsea hydrocarbon production such as a running tool 10 and a tubing hanger 12 however other members can include a remotely operated vehicle casing hanger wellhead housings and the like making the connection as example of which is shown in fig3 includes pushing the male stab 36 against the outer base 56 and breaching the pressure seal between the upper poppet head 51 and contour in the bore 57 as noted above the cavity 43 in the male stab 36 receives the poppet head 51 so the.