#12 AN W/P Fitting - Blue

The MEZIERE #12 AN W/P Fitting in blue anodized aluminum is a straight connector designed for high-performance coolant and water bypass systems in modern engine builds. As a mechanic working with serious cooling modifications, you'll recognize this as a critical component in custom water-cooling setups where factory radiator configurations won't cut it. AN fittings have become the industry standard for race engines, turbo systems, and heavily modified builds because they offer leak-free performance under extreme pressure and temperature swings. Whether you're upgrading a street rod, competition vehicle, or high-horsepower daily driver, this fitting bridges gaps in your cooling circuit with precision engineering.

Constructed from anodized aluminum, the MEZIERE fitting delivers corrosion resistance and lightweight strength—essential when every pound matters in performance applications. The #12 AN size (3/4-inch diameter hose compatibility) handles substantial flow rates without restriction, maintaining optimal coolant velocity through your system. The W/P designation indicates water-pump application compatibility, meaning this straight connector works seamlessly in bypass circuits and auxiliary cooling lines where proper flow redirection prevents hot spots and cavitation. Anodized blue finish isn't just aesthetic; it provides a durable oxide layer that resists oxidation and extends service life in harsh underhood environments. The compact 4.65 x 2.15 x 5.4-inch profile fits tight engine bays without requiring custom bracket fabrication.

This fitting is indispensable for fabricators and enthusiasts running custom water-cooling manifolds, auxiliary heater circuits, or turbo coolant lines on forced-induction platforms. Installation requires standard AN hose with 3/4-inch (12 AN) sizing and compatible male fittings at each end—be certain your hose ends match before assembly. Torque specifications follow AN standards: typically 15–20 foot-pounds for aluminum fittings to avoid cross-threading or crushing the seal. The straight configuration prevents flow turbulence compared to 90-degree adapters, a detail that matters when managing coolant temperature on high-output engines. MEZIERE's reputation in the performance cooling market ensures this fitting meets SAE standards and real-world durability expectations.