Undersea hydraulic coupling with multiple pressure-energized metal seals

A coupling, comprising:

• a male member having a probe to communicate fluid having fluid pressure, the probe having an external surface;
• and
• a female member for coupling with the probe of the male member to communicate the fluid having the fluid pressure, the female member comprising:
• a body defining a bore in which the probe is at least partially insertable, the bore defining a cylindrical recess having a first shoulder, a sidewall, and a second shoulder;
• an end ring disposed in the cylindrical recess and having opposing first and second faces, the first face disposed against the first shoulder, the second face defining a concave contour circumferentially thereabout;
• and
• a first C-seal ring disposed in the cylindrical recess adjacent the sidewall, the first C-seal ring having first and second sides and having inner and outer surfaces, the inner and outer surfaces respectively having inner and outer dimensions, the first side being convex and disposed adjacent the concave contour of the second face, the second side defining an internal cavity and disposed toward the second shoulder,
• wherein the inner and outer surfaces respectively have the inner and outer dimensions of the first C-seal ring, each of the inner and outer surfaces being free to engage the external surface of the probe and the sidewall of the bore respectively with a sealing force increasing with an increase in the fluid pressure.