#12 O-Ring to 1-1/4in Hose - Blue

The #12 O-Ring to 1-1/4in Hose - Blue is a precision straight water pump fitting engineered for high-flow cooling systems in performance automotive and marine applications. This adapter connects AN12 male O-ring ports to standard 1-1/4 inch hose barb outlets, making it an essential component for custom cooling loops, engine block drain lines, and auxiliary water circulation setups. Designed by Meziere Water Pumps, a trusted manufacturer of racing-grade cooling solutions, this fitting delivers reliable flow management in demanding thermal environments where factory cooling is insufficient.

Constructed from durable aluminum and finished in blue anodized coating, the #12 O-Ring to 1-1/4in Hose fitting combines corrosion resistance with lightweight performance. The straight-flow design minimizes turbulence and pressure loss compared to 90-degree adapters, optimizing coolant velocity through your circuit. The male O-ring thread interface (AN12) uses a metal sealing ring for superior leak-free connections under pressure, while the barb end grips hose securely without requiring crimped ferrules. The blue anodizing not only protects against oxidation in wet environments but also aids system identification during installation and maintenance.

This fitting is ideal for engine builders, track enthusiasts, and marine technicians upgrading or repairing custom water pump assemblies. It pairs seamlessly with 1-1/4 inch silicone or rubber hose rated for high-temperature coolant flow, and integrates directly into Meziere water pump manifolds and aftermarket aluminum blocks. Installation requires no special tools—simply thread the O-ring end onto your pump outlet or manifold port and secure the hose with a standard hose clamp on the barb side. Verify your system pressure rating and hose compatibility before installation to ensure optimal performance in your cooling circuit.