The Wilwood No-Bleed Quick Disconnect Fitting Kit make changing brake components faster with no need to bleed the system. A quick quarter-turn disconnects it, without tools, but they connect as secure as a threaded flexline fitting. The internal spring-loaded seal prevents air from entering or fluid from escaping.Engineered explicitly for high-pressure hydraulic brake fluid systems. Configure hydraulic component spares with the appropriate adapter and pre-bleed for instant use, when needed. Race-proven in circle track, off-road, and endurance road racing. Lightweight (0.6 ounces) aluminum, precision engineered and hard anodized with -3AN male fittings on each end.