The other pipes you see in the picture are two of the three suction lines; two skimmers and one pipe for the two drains. The third pipe was just cut out of the picture.
No suction port.
I might just have to ask the pool builder what it's for. The strange thing is I feel like it's almost an "air" pipe like on the house for plumbing system. Makes no sense for a pool though. And, if I remember correctly it was covered with duct tape and now that appears to be gone.
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