12AN Flare Cap Nut 2 Piece Black

The 12AN Flare Cap Nut 2 Piece Black from REDHORSE PERFORMANCE is an essential hose end component for high-performance fuel, oil, and coolant systems in custom-built vehicles and engine modifications. Designed for mechanics and automotive enthusiasts, this cap nut ensures reliable, leak-free connections in demanding applications. It is particularly useful for those plumbing fuel injection systems, upgrading turbo oil lines, or assembling custom cooling circuits.

This two-piece design features a flared female seat that mates with a 37-degree AN hose end fitting, creating a robust metal-to-metal seal that resists vibration and thermal cycling. The black anodized finish enhances corrosion resistance, making it suitable for underhood environments, while also aiding in quick identification of hose circuits during diagnostics. The lightweight design minimizes assembly weight while maintaining structural integrity under pressure differentials and vibration loads typical of performance driving.

This cap nut is ideal for fabricators and experienced mechanics who require high-quality components for their automotive projects. With its compatibility for high-volume applications such as turbocharger feed and return lines, transmission cooler circuits, or fuel rails on carbureted and fuel-injected engines, it is a versatile choice for enhancing performance and reliability.