Is Koolance QDC (High Flow) Restrictive?

[MadHacker]

I'm interested in getting Koolance QDC 13mm, 1/2" but was wondering how restrictive it really is.
I use an external rad box and though this would be perfect if it didn't restrict my flow.
Has anybody used this in their builds?

QDC (High Flow) Shutoff Nozzles, Pair w/ L-Bracket [13mm, 1/2"]


Thanks for any replies...

[Quatrix]

Hi I started this thread recently.

Hope you find the information in it useful. It seems as though CPC from colder are highly recommended. Especially the NS6 and HFC12 series

[MadHacker]

thanks I'll look at it...

[silverphoenix]

I have a pair of colder(I think) QDC's from Mcmaster carr, not using it anymore but when I did I saw no discernible difference in flow.