The system's combination of a metal-to-metal cone seal and a radial O-ring seal increases reliability and security from leaks. Cold deformation of the cone bottom produces zero gap, which prevents the Oring from extruding at extremely high pressure. A swivel nut allows for selected positioning, closer ports, and smaller component size. The use of adapters and swivel connections in tight-space constraints is greatly reduced and assembly time is cut in half. Available sizes include 1/4 to 11/2 in.