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It's the OP's drain plumbing - there's nothing to vibrate.If it does vibrate at all just wedge some rubber or cloth in there. My return pump has a Mr clean pad wedged next to it
I wouldn't expect any vibration but I don't know what kind of insane flow could be going through there. Some light cloth (within reason) won't hurt the bulkhead).It's the OP's drain plumbing - there's nothing to vibrate.
I recommend not wedging anything in there as it'll stress the bulkhead