ALmost all brands have the fittings now. I have used EKWB, Bitspower and Diamond Cooling and all were equal in how well they worked. Tubing can be obtained from anywhere. I have used E22 a lot, but also from ModWithMe when it was still active and it is all pretty much the same. It is a matter of looks which ones you want to use.
E22 in EK fittings, latest build will be at plumbing stage soon. Sent from my GT-I9505 using Tapatalk
I'm using 12mm OD, 10mm ID brass tubing with BitsPower True Brass C47 Enhanced fittings. They have a ridiculously string grip --that tubing won't pop out!