Roger SBIG can supply pumps for their camera's I have one sitting around here that I don't use. Water cooling is PITA in terms of extra lines and gear spread all over the place. You also need to be very very careful to keep the water temp above the dew point or you could cause condensation to form inside the camera and electronics have been known to fry under these conditions. The advantage gained is quite small and when compared to all the rest of the hassles that come with it and I am not a big fan. Better off buying a camera with a decent peltier and use air cooling. You have not mentioned which model camera you have bought so it is difficult to say anything of real value.
Mark
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