I've got (2) 50 hp Grundfos pumps collecting dust in our inventory if anyone's interested. They're good for ~240 psi @ 200 gpm. We no longer use this type of pump.
I wouldn't call them quiet. They won't fit in the largest of server cases. You'll need 460/3 electrical service. They would require something other than 1/2" tubing, but I'll make a sweet deal vs new cost.
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