Thanks everyone for the great comments! I'm very excited for this pairing, actually my first breeding season !
To answer your question Joe, there pvc piping with a plastic cup (i'm sure theres an official name for the piece but I don't know it). The cup fits perfectly into the pvc piping. Works great, I havn't had any bowls tip over since i've switched over to this method. Also makes it real easy to change water bowls, I have extra's and I just fill up a new plastic cup and remove the one that was in the bin to be washed.
You could always just buy a longer piece of pvc piping and have it cut into the size you want. Would probably save some money, I bought mine seperately and they go for about 3$ a piece.
Heres a picture of the two parts.
Michel