Inlet Fitting 1-3/4in

The ALLSTAR PERFORMANCE Inlet Fitting 1-3/4in (ALL 30041) is a precision adapter designed for high-flow cooling system applications where reliable fluid transfer is non-negotiable. Built for mechanics and automotive enthusiasts who demand durability in radiator, intercooler, and custom coolant line installations, this straight fitting bridges the gap between 1-5/8-12 in male O-ring ports and 1-3/4 in hose barb connections. Whether you're assembling a modified cooling system, upgrading to larger diameter hoses for improved flow rates, or fabricating a custom water jacket setup, this adapter ensures leak-free performance under pressure and temperature cycling.

Machined from aluminum with clear anodized finish, the Inlet Fitting 1-3/4in provides excellent corrosion resistance while maintaining a lightweight profile critical for high-performance builds. The O-ring interface on the 1-5/8-12 in male end creates a positive seal against port faces, eliminating the need for thread tape or sealant compounds—a design advantage that reduces assembly time and failure points. The hose barb side accepts standard 1-3/4 in diameter hose with a secure mechanical grip, preventing slippage under vibration and pressure fluctuations common in track vehicles, off-road applications, or turbocharged engine bays. At just 0.18 lbs, this compact adapter (4 x 2.15 x 7.05 in) integrates seamlessly into tight engine bay layouts without sacrificing flow capacity.

Professional builders and DIY enthusiasts trust ALLSTAR PERFORMANCE fittings for street rods, circle track race cars, drag vehicles, and extreme off-road platforms where coolant system integrity directly impacts engine longevity. This straight-through design eliminates turbulent flow disruptions inherent in 90-degree elbows, making it ideal for direct radiator inlet ports, intercooler feed lines, or custom manifold cooling passages. Installation requires only hand-tight assembly to the O-ring port, followed by hose-clamp securement on the barb end—no special tools or flange mounting hardware needed. Verify port thread size (1-5/8-12 in) and hose inner diameter (fits 1-3/4 in tubing) before purchase to ensure compatibility with your specific cooling system configuration.