3/8in Npt Aluminum Temp. Adapter Fitting - Red

The 3/8in NPT Aluminum Temp. Adapter Fitting in red anodized finish is a precision connection component designed for mechanical temperature gauge installations. This straight adapter bridges between 5/8-18 inch female ports and 3/8 inch NPT male threads, making it an essential component for engine bay temperature monitoring systems. Whether you're upgrading factory instrumentation or building a custom gauge cluster, this fitting provides reliable fluid transfer and accurate sensor mounting without compromising gauge accuracy or system integrity.

Constructed from lightweight aluminum with red anodized protection, this temperature adapter fitting resists corrosion in high-heat engine environments while maintaining structural integrity across thermal cycling. The NPT (National Pipe Tapered) male thread ensures a secure, leak-free seal when connected to standard automotive coolant passages, while the 5/8-18 female port accepts OEM and aftermarket mechanical temperature gauge bulbs. The anodized finish provides both aesthetic appeal and extended service life, protecting against oxidation and galvanic corrosion common in underhood applications where fluid contact and temperature fluctuations occur simultaneously.

Mechanics, hot rod builders, and classic car restorers benefit most from this adapter when retrofitting modern mechanical temperature gauges into older vehicles or customizing gauge placements in engine swaps. Installation requires standard wrench-style tightening into existing coolant system ports; proper sealing tape or thread compound on NPT connections prevents weeping. Compatible with AutoMeter mechanical temperature gauges and most aftermarket mechanical gauge systems, this compact fitting (measuring 2.85 x 1.15 x 3.8 inches) fits efficiently in tight engine bay spaces without requiring extensive plumbing modifications or custom fabrication work.