Fluidyne Radiator ?

[Gary Yarbrough]

I bought a Fluidyne radiator on e-bay and I'm planning to install it this weekend if I have time. But, I have a question... For the connection to the coolant reservoir, there is a threaded outlet but no actual fitting. Does anyone know what sort of fitting I can use? Is brass okay or do I need to find an aluminum fitting? I'm guessing that brass will be fine, since the drain plug is brass... But, I don't want to take any chances!