Aeromotive ORB to AN Flare 15608 vs Vibrant -3AN to -4 ORB Flare Adapter

These are not interchangeable parts. The Aeromotive 15608 is a -10 AN O-ring boss to -10 AN male flare adapter for high-flow fuel systems, while the Vibrant 16818 steps a -4 ORB down to a -3 AN male flare for oil and small fluid lines. Buy the Aeromotive if you are plumbing a large fuel feed or return; buy the Vibrant if you need a compact -4 to -3 oil adapter. Both are 6061 aluminum with black anodizing, and owners of both brands report clean threads and good sealing when the O-ring is lubricated and torqued properly.

• Choose the Aeromotive Orb To An Flare - 15608 if you are building a -10 AN fuel line and need an O-ring boss to male flare adapter with the flow to feed a high-horsepower engine.
• Choose the Vibrant 16818 if you are adapting a -4 ORB port to a -3 AN male flare on an oil system or small fluid line.