Turns out the bilge pump in the swamp cooler isn't designed to operate for hours at a time :) and it has failed. I wont need to immerse the motor so its got a good chance of surviving. Also I wont be running it constantly or flat-out. The flow rate is massive its a 12V 480W motor. Here is my offering which I will be finishing with a water tight capsule fore the motor and some fiberglass around the base to make it strong as. It draws too much current not a sensible option after all Here's what I got instead Model Name Aquapro AP1050 Waterfeature/Pond Pump Model Number 02AS003B Material Durable Plastic Wattage 18 Maximum Flow (litres per hour) 1050 Voltage 240 Cord Length (m) 10