Female -16AN to Male -12AN Adapter Fitting

The female -16AN to male -12AN adapter fitting (SKU VIB10838) is a critical flow control component for custom fuel, oil, and coolant line systems in modified vehicles. This adapter bridges two industry-standard AN (Army-Navy) port sizes, allowing mechanics and enthusiasts to connect larger -16AN hose assemblies to smaller -12AN manifold ports, carburetors, fuel rails, or cooler circuits without requiring complete line replacement. Whether you're upgrading fuel delivery on a high-performance engine build or reconfiguring cooling lines on a restomod project, this stepped adapter eliminates compatibility gaps while maintaining system integrity.

Constructed from durable aluminum or brass, the female -16AN to male -12AN adapter fitting uses tapered AN threads and a precision-machined body to ensure leak-free connections under pressure and temperature cycling. The stepped design reduces internal turbulence compared to multiple adapter stacks, preserving fluid velocity and minimizing pressure loss in fuel or cooling circuits where flow consistency matters. The compact 4.53-inch length and 0.13-pound weight make installation straightforward in tight engine bay spaces, while the standardized -16AN female port accepts any industry-compatible hose or line assembly, and the -12AN male port screws directly into existing manifold or block ports without adapter chains.

This adapter is indispensable for fuel-injected and carbureted performance builds, LS engine swaps, and vintage restorations where stock -12AN ports must accommodate modern braided stainless hose in -16AN diameter. Experienced mechanics rely on it to simplify plumbing layouts without downgrading flow capacity, making it a go-to solution for anyone modernizing fuel systems, installing turbocharger oil coolers, or upgrading factory cooling infrastructure. Ensure your hose ends and manifold ports match -16AN female and -12AN male specifications respectively before purchase to guarantee proper fitment.