It's the cheap horizontal bobber kind. Like this...
http://www.usplastic.com/catalog/item.aspx?sku=23079&gclid=CKeakp3F_scCFQaKaQodbR8L6g
Thanks, thats the one that I have. I'll try it out and see where the water line ends up. If not I'll try the adjustable arm type. http://www.usplastic.com/catalog/item.aspx?sku=23176&gclid=COn69dPQ_scCFdccgQodFdgPbg
The only thing I don't like about the adjustable type is the wing nut might loosen up.
Then do you have a valve that cuts off at the RODI unit when the back pressure gets to high?
My RODI unit is from BRS and it has the cut off valve built in. It will shut off the waste line when the float valve shuts off.