#12 Female x #10 Male Swivel Reducer

The #12 Female x #10 Male Swivel Reducer from Fragola is an essential fitting for custom fuel, oil, and coolant line systems in automotive builds where space, pressure containment, and directional routing are critical. This adapter reducer bridges two different AN-sized ports, allowing technicians to downsize from larger #12 lines to smaller #10 connections without sacrificing flow efficiency or system integrity. Whether you're fabricating a custom fuel rail, routing brake lines around engine bay obstacles, or integrating aftermarket cooling systems, a quality swivel reducer eliminates the need for bulky manifold blocks and keeps your plumbing clean and compact.

The swivel design is the key advantage here—the fitting rotates freely at the connection point, allowing you to angle your hoses or hard lines without twisting the main line itself, reducing stress on welds and crimps during installation and operation. Fragola's engineering ensures consistent internal bore sizing to minimize turbulence and pressure drop across the transition, critical when working with high-flow fuel systems or precision cooling circuits. The compact footprint of 1.95 x 1.5 x 4.2 inches and lightweight 0.15 lbs design makes it ideal for tight engine compartments where every millimeter counts, and its proven durability handles both fuel and hydraulic applications reliably.

Experienced fabricators and engine builders rely on this reducer when downsizing fuel lines to carburetors, EFI pumps, or remote-mounted filters, and when adapting radiator hose connections in restorations or LS swaps. The swivel feature is particularly valued in tight V8 engine bays where rigid fittings create assembly headaches; the rotating end lets you pre-assemble complex line circuits off-engine without force-fitting or over-torquing. Installation is straightforward with standard AN wrenches—simply thread the female #12 port into your main line or component, then screw your #10 hose barb or hard-line fitting into the male end, and the swivel movement handles the rest during final positioning.