I would like to put some sound dampening on the bottom of my submersed MAG pumps. I have some outside house 3/4" pink foam insulation. Do you guys think this would be safe?
I don't think the pink foam would last long and might release something into the water. I would stay away from that and try and put something made of rubber under it. There are millions of things that could be used. I have used those rubber feet that are made to go underneath the legs on your couch to keep the couch from sliding on a tile floor.
McMasterCar.com sells all kind of rubber pads.
You could also Google search for "vibration isolators? and find many choices.
I've been using a mouse pad for a couple of years with my submersed Mag pumps. 8O 8O Hasn't harmed anything that I can tell. Does deaden the vibration.
Neoprene would be fine. Most mouse pads aren't made of neoprene, I don't think.
I used a mouse pad under an externally mounted mag9.5 and it still rotted in a few years time. I got water spilled on it a few times, so it did get wet. I would thing that if it had been submerged the whole time it wouldn't have lasted long at all.
I go down to my local gasket shop and get small pieces of leftovers from them. I always get viton, but that's just me. I'd be happy to mail you some, just shoot me a pm.