5/16 Male to 6an ORB OE Quick Connect Fitting

The 5/16 Male to 6AN ORB OE Quick Connect Fitting from EARLS is an essential hydraulic coupler for custom fuel, coolant, and brake line applications in high-performance vehicle builds. This precision-engineered adapter bridges metric 5/16 male ports to 6AN ORB (O-ring boss) female connections, making it invaluable for engine swaps, fuel system upgrades, and turbo cooling circuit modifications. Whether you're retrofitting a modern engine into a classic platform or optimizing factory OE connections in a modified powertrain, this fitting delivers reliable, leak-free performance under demanding conditions.

EARLS fittings are manufactured to exacting standards using aerospace-grade aluminum and stainless steel, ensuring durability in high-vibration automotive environments. The 6AN ORB specification uses an internal O-ring seal design that eliminates the need for thread sealant tape, reducing installation time and eliminating potential contamination in fuel or coolant circuits. The quick-connect feature allows for rapid disconnect and reconnect without system drainage, a critical advantage during diagnostic work, component swaps, or routine maintenance on modified vehicles. Compact dimensions (1.4 x 0.95 x 2.95 inches) permit tight fitment in engine bays with constrained space, while the lightweight construction (0.06 lbs) contributes zero parasitic weight to your build.

This fitting is ideal for fuel system tuners, engine builders, and enthusiasts performing serious powertrain modifications—particularly those integrating OE components with aftermarket plumbing standards. It excels in forced-induction setups requiring auxiliary coolant loops, custom fuel pressure regulation circuits, and fuel cell installations where metric OE ports must interface with modern braided hose assemblies. Installation requires no special tools beyond standard wrenches; ensure adequate clearance in your engine bay and torque fittings to manufacturer specifications to prevent weeping. Verify compatibility with your specific cooling, fuel, or brake circuit before ordering to ensure proper system pressure rating and flow capacity for your intended application.