Brass fitting in head

Pascoe272

What is this for? It's in the head that i took off but not in the new one

Pascoe272

Joins to radiator hoses before thermostat

MazdaMitch

That is not there from the factory.
Someone added that for some odd reason.

Pascoe272

MazdaMitch thanks mitch ur a absolute champion. Very appreciated

Axel-Breaker-Earl

You may want to let us know what year & model vehicle you're working on also.......it will help other members when they try to help you diagnose any issues.