my magdrive pumps come with a 1/2" thick piece of foam that is stickered to the bottom of the pump that dampens a lot of vibration. I carried this design over to other pumps that I'm using in the sump and simply wrap them in foam with a rubber band. The foam is like a thick spongy material (on the magdrive). For my other pumps I got foam sheets from Michaels.
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