Y Block Kit 2 to 1

The ALLSTAR PERFORMANCE Y Block Kit 2 to 1 (ALL 31159) is a precision fluid distribution fitting engineered for custom cooling systems and high-flow water pump applications. This aluminum Y-block adapter consolidates dual outlet lines into a single inlet connection, making it an essential component for engine builders, hot rod enthusiasts, and performance shops designing compact or manifold-fed cooling architectures. The fitting's compact footprint and lightweight construction reduce plumbing complexity while maintaining reliable flow dynamics across demanding thermal management setups.

Built from natural aluminum, the Y Block Kit features a 1-1/4 inch NPT female inlet that accepts standard threaded water pump connections, with dual 12 AN female O-ring outlets for modern hose compatibility. The O-ring sealed female ports eliminate leak-prone external flange bolts, providing superior vibration resistance and sealed reliability typical of factory-engineered hydraulic systems. The forged aluminum construction balances strength with weight savings—the entire assembly weighs just 0.36 lbs—ensuring your cooling loop performs without adding unnecessary rotational mass to the engine bay.

This fitting benefits engine builders transitioning from traditional radiator-fed systems to remote or split cooling circuits, as well as fabricators integrating secondary coolers or expansion tanks into existing water pump feeds. Installation is straightforward: thread the NPT inlet to your pump outlet and secure dual AN hoses to each O-ring port using standard 37-degree flare crimps. The natural aluminum finish resists corrosion in sealed cooling loops, though anodizing is recommended for long-term durability in high-vibration or salt-air environments. Compatible with any water pump sporting a 1-1/4 NPT discharge port.