Just looking at the fluidyne coolers and some of then have extra fittings on them they say they have 2 an12 and 1 3/8 ips and 1- 1/2 port .Whats up I thought 1 in and 1 out. I know but what can I say

can you say "water cooled?"

Most likely a port for coolant. I.E. an automatic trasmission fluid cooler...

the small ports are to drain the oil and or bleed air out of the system.

some of the bigger coolers hold quite a bit of oil so being able to drain the cooler comes in handy.

I stand corrected...I really like hanging around smarter people than me....

Thanks Dave did'nt think ya wanted to mix water &oil

on mine, one pair is 12 AN, the other is 1/2 in (IIRC) pipe.
Options for plumbing.