Straight Adapter Fitting -16AN to 3/4in

The Straight Adapter Fitting -16AN to 3/4in from Vibrant Performance is a precision hydraulic and fuel line adapter engineered for custom automotive builds where port sizing transitions are critical. This fitting bridges the gap between -16 AN (JIC) metric thread fittings and standard 3/4-inch NPT ports commonly found on engine blocks, fuel rails, transmission coolers, and aftermarket manifolds. Whether you're designing a custom fuel system, upgrading cooling lines on a turbocharged engine, or integrating an external transmission cooler into your platform, this adapter eliminates the need for bulky reducer blocks or multiple transition fittings.

Constructed with Vibrant's proven aluminum alloy body, the straight configuration ensures zero flow restriction and minimal turbulence during high-pressure fluid transfer—essential when running fuel injection systems, power steering upgrades, or closed-loop cooling circuits on modified vehicles. The -16AN port features the industry-standard 37-degree JIC flare interface with corresponding O-ring face seal, while the 3/4-inch NPT thread side accepts standard pipe-thread components without adapter stacking. Precision machining ensures concentricity and eliminates micro-leaks at the transition zone, a common failure point when using inferior reducers on high-vibration engine bays.

Mechanics and performance builders rely on this fitting for fuel system retrofits, intercooler plumbing, auxiliary water pump circuits, and transmission line work on LS-swapped platforms, vintage restorations with modern fuel injection, and track-focused builds demanding reliability under sustained pressure cycles. Installation requires standard -16 AN hose fittings (braided stainless or PTFE-lined preferred) on one end and NPT-compatible adapters or manifold ports on the other; ensure proper sealant application on NPT threads and confirm compatibility with your specific system pressure rating before assembly. Weighing just 0.13 lbs, this adapter introduces negligible weight penalty while delivering robust structural integrity in tight engine bay configurations.