Inverted Flare Plug - 9/ 16-18

The Inverted Flare Plug - 9/16-18 is a precision hydraulic and fuel system fitting designed for high-pressure applications requiring reliable, leak-free connections. This male hex head plug seals inverted flare lines commonly found in custom automotive cooling systems, fuel delivery assemblies, and brake circuits where vibration resistance and long-term durability are non-negotiable. Engineered by Racing Power Co-Packaged, this component addresses the critical need for secure port closure in performance and restoration projects.

Constructed from steel and finished with zinc oxide coating, the Inverted Flare Plug delivers corrosion resistance while maintaining structural integrity under thermal cycling and pressure fluctuations. The 9/16-18 inverted flare connection standard ensures compatibility with industry-standard SAE fittings, and the hex head design permits wrench engagement for secure installation and removal without line damage. Zinc oxide plating provides long-term protection against rust and oxidation, critical for engine bay and underbody mounted systems exposed to moisture and road salts.

This fitting is ideal for custom hot rod builders, vintage car restorers, and racing enthusiasts who demand OEM-quality components for closed-end fluid lines. Installation requires standard wrenching tools and care to avoid over-tightening, which can damage the flare cone. The compact footprint (3.9 x 0.65 x 5.95 inches) allows integration into tight engine compartments, making it suitable for both stock restorations and modern performance builds where original-specification fittings are unavailable or obsolete.