How to handle varying diameters in a system?
 

I've noticed that there seems to be all sorts of different diameters between rads and pumps. For instance, in a system with an Eheim 1250 pump (1/2" diameter intake and 3/4" diameter outtake) and DD Copper Rad (3/8" diameter intake/outtake) you've got 3 different diameters. How do you run tubing between these varying intakes/outtakes? Do you just hose clamp the wider tubing over the narrower pipes on the rad? Do you splice different tubing together? Wouldn't any sort of solution that moves from a larger diameter to a smaller one screw up flowrate? This is very confusing to me. :(

Ideally I'd like to build a system that has the same diameters for all the intakes/outtakes so I can just avoid this headache, but I can't seem to find a good pump/rad/waterblock combo.

I'm using a SELTZ 1200l/h pump with Senfu rad and DD Maze2. The Senfu rad and the maze2 both use 3/8 and the pump has 1/2 inlet AND outlet. I use adapters to bring 1/2 down to 3/8 and the whole circuit is in 3/8. (BTW it've dremel'd out those inlets on the Senfu so they *are* 3/8)

Could you elaborate on these adaptors?

They are a peace of plastic w/ a big barb and a little barb and a hole in the middle
:rolleyes:

If you go to the local hardware store, the plumbing section usually has NPT, comptression, and hose barb fittings. Also, you can go directly to the source at http://www.parker.com/fcg/