A back-up ring assembly for high pressure gas components includes a first ring having and a second ring. The first ring is split at a first location with a first split angle, while the second ring is split at a second location with a second split angle. The first ring is concentrically positioned adjacent the second ring with the first location being offset relative to the second location. The back-up ring assembly is positionable adjacent to an O-ring in a sealed coupling in a high pressure application.