6AN to 4AN Y-Block Single Inlet Dual Outlet

The 6AN to 4AN Y-Block Single Inlet Dual Outlet from Redhorse Performance is a precision hydraulic distribution fitting designed for high-pressure fuel, oil, and coolant systems in performance vehicles, race platforms, and tactical equipment installations. This Y-block adapter serves operators and technicians who require reliable fluid routing in compact engine bays or demanding mobile field setups. The single inlet / dual outlet configuration allows you to split one incoming line into two separate circuits, a critical capability when upgrading fuel delivery systems, installing auxiliary cooling loops, or managing redundant hydraulic pathways in mission-critical platforms.

Constructed from aerospace-grade aluminum or forged steel with NPT or JIC port threading, the 6AN to 4AN Y-Block features precision-machined passages that maintain flow integrity under sustained pressure cycles. The 6AN inlet (size -6 SAE, approximately 3/8" OD) accepts primary flow, while dual 4AN outlets (-4 SAE, approximately 1/4" OD) proportionally distribute volume to secondary systems. Weighing only 0.09 lbs and measuring 2.8 x 1.1 x 3.85 inches, the compact footprint minimizes installation complexity in space-constrained environments. Redhorse fittings are engineered to mil-spec tolerances, ensuring zero-leak performance at operating pressures typical of turbocharged or supercharged fuel systems (50–100+ psi) and auxiliary cooling circuits.

Law enforcement, military, and civilian performance enthusiasts rely on this Y-block for upgrading fuel systems in patrol vehicles, tactical support platforms, and competition engines where dual-circuit distribution is mandatory. Installation pairs seamlessly with -6 braided stainless hose on the inlet and -4 hose or rigid tubing on outlets, compatible with standard AN fittings found across automotive and aerospace industries. Whether you're reconfiguring a mobile command platform's cooling system, upgrading a performance interceptor's fuel delivery, or installing redundant hydraulic pathways in off-road tactical vehicles, this precision Redhorse component delivers dependable split-flow functionality in one compact, field-proven assembly.