I would recommend 2" schedule 40 pipe. I have found that the Spaflex can sometimes have pin hole leaks if it was not handled correctly. Personally I would recommend 1 2" line for return, 1 2" line for drain to sump and another 2" line to be able to run small pipe/tubes/wires into the basement. Wrap the pipe in rubber floor mat and clamp to the wall. I would even recommend wrapping pipe in fiberglas insulation to deaden any noise of water movement. Wall cavities tend to amplify noises!!!
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