i have two MP60's that I've used on my 500 Gallon Tank the last few years with no issues . The build the dates are from 2013 I believe( velcro is covering one of the dates on one unit) here are a couple of blemishes on the dry side from a bead of sealent caulk that I would use to keep these units attached to the acrylic so they didn't fall. Great pumps tons of flo for 450 shipped for both of them.
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