I believe you are talking about a Poly Group Pool (Summer Escapes or Pro Series) Intex pools come with a ground pump. I have a read several forums here on how to convert from the skimmer pump to a conventional pump / filter setup. Here is a part you might be interested in ....
This fitting didn't fit perfect. It was a little small on the OD of the fitting compared to the hole in the liner but did not leak at all. Bought them locally at the pool store and added a real pump.
Best thing I ever did was add a proper pump that allowed me to run a Kreepy Krauly suction side pool cleaner.
An intex fitting will be 40mm threads, Standard pool equipment like a Hayward will use 1 1/2" threads. There has been allot of posts on how to convert and some different ways of accomplishing the task. Below is a thread you might find useful for an intex to standard pool equipment install. The links provided from Joe would also be useful ...
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