A coupling and metal seal are disclosed, primarily for use in undersea hydraulic applications. The female member of the coupling is of three-piece construction. The main body portion accepts a cylindrical retainer which is held captive within the body by means of a spring clip or snap...http://www.google.es/patents/US5762106?utm_source=gb-gplus-sharePatente US5762106 - Undersea hydraulic coupling and metal seal
