Want to add a water temperature gauge to your car? This little blue aluminum adapter is the key. It has a 40mm outer diameter, which means it's designed to splice right into a standard radiator hose (you cut the hose and clamp this in line). It has a threaded port (usually 1/8\ or 1/4\ NPT) where you can screw in an aftermarket temperature sensor for your gauge. It's an unbranded, generic part, but it's a simple and effective solution for getting an accurate coolant temp reading. The blue anodized finish adds a bit of color to your engine bay. Essential for track cars, performance builds, or just keeping a closer eye on your engine's health.
