What size?

Hi I have a Swiftest Radiator that I need the barbed hose fittings for and I am unsure what size thread I need.



This is the radiator.



http://www.swiftnets.com/products/MCR220-QP.asp



I am using ½ tygon tubing. Wondering if you could tell me what I need


Thanks

Looks like 3/8 NPT = National Pipe Thread

it should've already come with some fittings...

if not, send me a PM with your address and I'll send you a couple 3/8" NPT 1/2" barbed fitting for free - I have a bunch of extras