[Orion]

I also used the same basic principal for the return water. I used the same elbow piece, but a threaded cap on the inside for this one. Here's why I used the cap: I drilled a 3/8" inch hole in it, just a tad smaller than the pump outlet, heated the cap up with a heat gun (boiling it in water works just the same. The point is to get the cap heated up so that it will give a little bit allowing the end of the pump return to be squeezed in it.). This doesn't give a water tight seal around the pump outlet, but so far I've found it to be enough to allow minimal water leakage plus snug enough to keep the pump in place.