Pressed in Heater Hose Fitting
(On the passenger side next to the t-stat)

Any decent auto parts store will have these things ...
Neither of mine was "tapped" they just press in.
I used a little sealant on the tube and carefully tap it in the hole.

Hardest part is getting the old one out-monstermach

Ford P/n C5AZ-8555-B “Tube Water”-Chris Kelly

NAPA p/n 660-1580 –Carl

I use Loctite retaining compound. A high strength like 609 or 680.-Dion