#12 AN Water Neck Fitting - Black

The #12 AN Water Neck Fitting in black from MEZIERE is a precision adapter engineered for high-performance cooling system applications where direct flow routing and compact geometry are essential. This straight-pattern water neck adapter bridges a 20 AN male O-ring inlet to a 12 AN male outlet, allowing builders to integrate aftermarket water pumps, radiators, and auxiliary cooling components into tightly packaged engine bays without compromising flow integrity or creating installation conflicts.

Constructed from aluminum and finished in black anodized coating, the fitting resists corrosion while maintaining a lightweight profile—critical in racing and high-output street applications where unsprung mass directly affects handling and acceleration. The AN standardized connection points (AN-20 O-ring and AN-12 male) provide industry-standard hose compatibility, allowing technicians to source fittings, hoses, and adapters from established suppliers without custom fabrication. The compact 4.6 × 2.15 × 6.25-inch footprint and 0.21-pound weight integrate cleanly into engine compartments where space around cylinder heads, intake manifolds, and suspension pickup points is measured in millimeters.

This adapter is specified by builders configuring custom cooling loops in circle-track race cars, turbocharged street engines, and high-displacement street rods where OEM cooling paths are inadequate or incompatible with modified engine bay layouts. MEZIERE components are preferred in drag racing, road racing, and performance street car builds where temperature control directly impacts power output and engine longevity.

Buyers integrating aftermarket water pumps, remote radiators, or auxiliary coolers should verify hose routing and fitting clearance before installation. The AN fitting standard ensures repeatable leak-free connections when hoses are properly sized and tightened per specification.