abuts shoulder 55 in the female member bore and when the retainer 51 is tightened against the retainer sleeve the hollow metal seal 28 may be slightly compressed axially to preload the seal prior to engagement of the male and female coupling members also shown in fig2 is the dove tail seal between the retainer 51 and the retainer sleeve 53 the dove tail seal also forms a radial seal around the extended probe section of the male member hollow metal seal 28 is positioned on internal shoulder 77 in the female member bore as shown in fig2 and fig3 a face type seal may be used in the present invention instead of a hollow metal seal that engages the circumference of the male member the face seal is used to engage the leading face of the male member or probe additionally where two seals are used to seal the junction between the male member and female member the extended probe section of the male member may be stepped so that the elastomeric seal such as the dove tail seal shown in fig2 engages on a larger diameter than the metal seal such as hollow metal seal 28 now referring to fig4 of the drawing male and female.