Quote Originally Posted by gabe View Post
I am curious: Why concern yourself with a .125" reduction over a few inches when you just demonstrated that the same reduction over several feet in a typical cooling loop is only affecting temps by a mere ~1C ???
'cos sudden contractions of 0.125" are significantly more expensive (PD wise) than some run of tubing length of equal diameter. Compare the modelled 8mm over barbs to the modelled 8mm with push-fits.

The goal (well, my goal) is to find a solution that uses the thinnest possible tubing that offer no performance impact greater than ~0.2-0.3C over a 1/2" barbed solution. A 1C difference is unacceptable to me, but that's just my choice. Others have their own preferences for what's acceptable.

Perhaps soft tubing stretched over compression fitting orifices may be the other viable solution?