O-Ring Boss Port Y-Manifold

The MEZIERE O-Ring Boss Port Y-Manifold (WAM12ANU) is a precision aluminum water distribution block designed for custom cooling system integration in high-performance automotive applications. This Y-shaped fitting consolidates multiple coolant lines into a single, compact assembly, reducing plumbing complexity while maintaining full flow capacity through strategically positioned ports.

The manifold features a 20 AN female O-ring port as its primary inlet and dual 12 AN female O-ring outlet ports, allowing flexible routing of coolant to multiple destinations—typically a water pump inlet adapter setup common in forced-induction and street-performance engine builds. The polished aluminum construction provides corrosion resistance and a clean visual appearance under engine bay inspection. O-ring boss ports ensure positive, leak-free sealing without thread-dependent reliability, a critical advantage in high-vibration and high-pressure cooling circuits. The compact 3.75 x 2.4 x 5.6-inch footprint makes installation feasible in space-constrained engine compartments.

This manifold is engineered for builders and technicians fabricating custom cooling systems on fuel-injected performance vehicles, turbocharged engines, and LS-based swaps where OEM cooling passages are inadequate or unavailable. The Meziere brand reputation for precision-machined water management components makes this fitting a trusted centerpiece for circuits demanding precise flow distribution and reliability under sustained boost pressure and elevated coolant temperatures.

AN port sizing follows industry-standard hose and adapter compatibility, ensuring seamless integration with a broad range of braided stainless steel cooling hoses and aluminum fittings commonly stocked by performance cooling specialists. Proper O-ring sizing and port torque specifications should be verified against Meziere documentation to guarantee seal integrity during engine operation.