I'm not sure, but I think you're talking about the Loc-Line products. They are mainly used in industry for providing lubricant to machining equipment, but work great for directing water flow in aquariums.
Here is their website: http://www.modularhose.com/
I bought mine from Doctors Foster and Smith: http://www.drsfostersmith.com/produc...90&pcatid=4090
Here are some pictures of mine (pardon the quality, I just cropped some photos that I already had).
Side view of two of the returns:
View from above the water where the return goes over the rim of the tank:
I used plumbing PVC pipe from the home improvement store to fabricate the pieces that go over the rim. There are many ways that you can do it, but I used 90 degree fittings that were threaded on one side, with a "slip" connection on the other. You then connect the two 90s together on the "slip" side using a short piece of PVC and some PVC cement to make a "U" that fits over the rim. That way I could thread in the Loc-Line fitting on one side of the "U" and the nipple for the hose on the other.
I hope this helps.