Originally Posted by hammadj
I was planning on using them for a drain line. As for the tubing, the fittings for 1/2,3/4 were much cheaper and had more variety. I'll hunt around and see if I can find some good and cheap 3/8, 5/8 fittings.
Dont quote me on this for compression fittings but at least with barbs its better to use 1/2" fittings with 3/8" hose. It gives you a tighter more leak proof connection. So what I'm trying to say is Keep all your 1/2" fittings but just use 3/8 hose on the whole system. that way you don't have to "step down" to 3/8th" from the 1/2" to fit your mother board. there is really no reason to use 1/2" hose over 3/8th" like I said before you wont notice the difference. you wont have to buy the step downs and save a few bucks.
As far as using quick disconnects for the drain hose, Quick disconnects have a check valve in them so when you disconnect them they don't leak. If you want to use them as the drain you would have to buy another set to hook up to them to make them actually drain. much easier to just use the T fitting and have it capped or run a line above the highest point in the system. I dont have anything really when I want to drain I suck the res dry with some extra hose and then just disconnect one of the lines from a barb and let it drain out.