Sometimes the terminology is what gets in the way of finding the right piece to the puzzle. If you have a pool with water pipes that flow back to the pool, these are called "Return Lines". On older pools without a booster pump you attach a hose to the hole in the wall where you have water pumping back into the pool. Your automatic cleaner is using the water pressure from your filters pump to drive itself around the pool and to push debris into a filter bag. In my moms pool, we are having a hard time getting the cleaner hose attached the "Wall Fittings" or "Return Line Wall Fittings" or "Pool Return Jet" . Her pool basically has some holes in the wall that water shoots out of. No threads or special fittings to attach a hose to are "built in" and the holes have some old pipe material that is crumbling away.
For the polaris model automatic cleaners, a "Stub Pipe Connection Kit" is used to a create a fitting that the automatic cleaner can attach to. It has an expansion connector that is basically a plastic tube that is split on one end, you push this into the return line hole then you push a smaller diameter copper tube into the expansion tube which forces the expansion tube to (you guessed it" expand. The expansion of the diameter of the tube should lock it firmly in place and let you connect about half dozen other little parts that finally allow you to attach your pool cleaner. We are at the point now that the stub pipe fitting will no longer stay in place. Here is a diagram a couple of return line wall fittings used to attach a polaris quick connect that is found on the end of the hose running to the cleaner.
Another good description of the return line fittings can be found here >>>
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