Because I had 2 hours in the airport (delayed flight out of DFW because of the hurricane) I did more research and I wanted to post back here with what I found. It appears that the original live well/wash down pump in the Osprey 225 was a diaphram-type pump. These are self-priming and can be above the water line. The new pumps are centrifugal, cannot be mounted above the waterline, and are not self priming. This means they have to be mounted in the bottom of the boat, which is next to impossible. As best as I can tell, the replacement pump for the 225 is the Shurflo Blaster II. It's a self-priming pump and will mount in the transom access location of the OEM pump.