Fitting12an Male to 16an Male w/External Screen

The Fitting 12 AN Male to 16 AN Male with External Screen from MOROSO is a critical adapter for high-flow fuel system upgrades, cooling loops, and transmission cooler plumbing in performance and street rod applications. When you're stepping up your vehicle's hydraulic capacity—whether transitioning from smaller braided hose to larger diameter lines or consolidating multiple fuel sources—this adapter bridges the size gap while protecting your system with an integrated external screen. Built for mechanics and enthusiasts who demand reliability under pressure, this fitting solves the common challenge of connecting mismatched AN port sizes without compromise.

The external screen design is engineered to trap debris and contaminants before they reach sensitive downstream components—fuel injectors, transmission governors, or cooler cores—where blockages can cause catastrophic failure. AN fittings use a 37-degree JIC flare standard that creates a metal-to-metal seal without relying on thread sealant, ensuring leak-free performance even under surge conditions common in racing and boosted applications. The 12 AN male inlet accommodates standard 3/4-inch braided hose, while the 16 AN male outlet provides the higher flow capacity needed for upgraded fuel delivery systems or auxiliary cooling circuits. MOROSO's manufacturing precision ensures concentricity and surface finish that prevents galling during installation.

This adapter is essential for fuel system builders, engine swappers, and anyone upgrading from OEM restrictive plumbing to a custom loop capable of supporting carbureted engines, EFI conversions, or twin-fuel setups on hot rods and classic cars. The external screen demands periodic inspection—typically every 20 to 40 hours of engine run time on high-performance builds—to prevent backpressure issues from trapped particulate. Installation requires AN wrench tools (standard in any serious mechanic's toolkit) and hand-tight-plus-one-quarter-turn final torque to avoid thread damage. Verify that your incoming hose size accepts a 12 AN male fitting and that your plumbing outlet uses 16 AN female ports before ordering.