What metric hose fitting is close to, but slightly smaller than 1/8NPT? I recently bought an IE aluminum radiator and there is a tapped hole for the hose fitting that goes to the radiator fill tank. IE thought it might be an 1/8NPT, but and 1/8NPT fitting doesn’t fit- it’s too big. Every other tapped hole on the radiator is metric. Any ideas? And where do I get the fitting?
Metric Radiator Fitting
I’ve had good luck ordering metric fittings from Stewart Warner. McMaster also has just about anything you need once you figure out the size.