My Mine ball valve was 3/8"NPT The tank is 1/2"NPT I had a adapter that went from 1/2 to 3/8. Male to male. It is screwed into the tank.
I didn't know they had 1/2" or i would have gotten one.. Here is a 1/2"NPT that will screw into the tank. http://www.mcmaster.com/#4912k89/=395eig
And you can use these coolant snap on parts http://www.mcmaster.com/#10095k33/=395gxg
or you can just get a 1/2" pipe nipple about 2 or 3" long to get you to the edge.. Less parts. I just might do it. I llike the 1/2" Valve. Less connections seeing it would screw right in.
I Just might make my order today. I will get it tomorrow.. mcmaster is fast. Day or Two.
Edit note. Made links into clicky's.
Edited by: danskool