Thanks! I emailed InterFab on the part that mschumak referred to, but they said they don't have a return line fitting, that they require running a line off the pump as well. Then a dude at Leslie's Pools told me yesterday top get a threaded piece of PVC at Home Depot and run it up that way. I'd really like to see an image of the T-fitting - as well as the line direct from the pump. The hose assembly that came with the slide has a valve at the end of it, so at least there's one less thing I need to get.