-16an Fitting - Blue

The MEZIERE -16AN Fitting - Blue (WP16016B) is a precision hydraulic adapter engineered for high-flow cooling systems and water pump installations on performance engines. This straight-configuration fitting connects 16 AN male O-ring ports with reliable aluminum construction, anodized in distinctive blue for both durability and visual identification within complex plumbing layouts. MEZIERE fittings are recognized in the performance cooling and race engine market for maintaining system integrity under sustained boost and thermal cycling.

Machined from lightweight aluminum and finished with blue anodizing, this 16 AN fitting delivers corrosion resistance critical in engine bay environments exposed to coolant, salt spray, or moisture intrusion. The O-ring seal design (male to male configuration) ensures a redundant sealing interface, reducing the risk of weeping at connection points under pressure. At just 0.18 lbs and compact proportions (3.75 × 1.65 × 5.8 inches), the fitting integrates cleanly into tight manifold spaces without adding bulk or requiring custom fabrication. Straight-port geometry minimizes flow turbulence, supporting sustained coolant circulation in high-RPM or forced-induction applications.

This adapter suits builders and technicians assembling custom water pump circuits on turbocharged, supercharged, or naturally aspirated engines where OEM hose routing is impractical. The -16AN port size handles the flow demands of modern performance cooling systems, particularly those using external or relocated pumps. Color-coded blue identification accelerates system diagnostics and documentation during installation and maintenance, reducing assembly error in complex engine bays where multiple coolant lines converge.

MEZIERE components are engineered for compatibility with LS-platform, Gen III/IV small-block Chevrolet, and other performance applications requiring precision cooling control. The straight fitting design eliminates elbows, reducing joint count and potential leak paths in critical pump-to-block transitions. Whether upgrading an existing system or designing a complete custom cooling architecture, this blue-anodized 16 AN fitting provides the material quality and engineering precision expected in motorsports and high-horsepower builds.