#16 to #12 Flare Seal Reducer

The #16 to #12 Flare Seal Reducer is a precision hydraulic adapter designed for marine fuel systems, cooling lines, and high-pressure applications where AN (JIC) fittings must transition between different port sizes. If you're running a high-performance engine bay or modernizing older fuel-delivery plumbing, this straight reducer connects a 16 AN female port to a 12 AN male port, eliminating the need for bulkier multi-fitting solutions. Built to the demanding standards of SAE J518 aerospace specifications, it's essential for boaters and marine technicians who demand leak-free, vibration-resistant connections.

Constructed from lightweight aluminum and finished in blue anodized coating, the #16 to #12 Flare Seal Reducer resists corrosion in saltwater and freshwater environments while maintaining its structural integrity under pressure cycling. The flare seal design—featuring a 37-degree conical sealing surface—creates a metal-to-metal compression lock that prevents weeping under dynamic loads common in marine engines. Aluminum construction reduces overall system weight without sacrificing strength, critical for performance vessels where every pound matters. The straight configuration ensures direct, unobstructed flow with minimal turbulence, preserving system efficiency and protecting downstream fuel injectors or cooler lines from contamination.

This adapter is ideal for custom fuel system builds, engine swaps, and retrofit cooling-line installations where OEM hose runs don't match modern AN fitting standards. Boaters upgrading to fuel-injected outboards or installing aftermarket high-flow fuel filters will find this reducer indispensable for bridging mismatched port sizes without extra elbows or tees. Installation is straightforward—thread the 12 AN male end into the receiving port and hand-tighten the 16 AN female end to your hose or component, then secure with a wrench to specification. Always use two wrenches (one on the body, one on the nut) to prevent twisting the fitting and damaging seals. Compatible with all standard -16 and -12 AN hose assemblies and rigid tubing systems rated for flare fittings.