Im an ID student at Metro Denver and Im trying to find manufacturers of small parts. For example, I have been trying to find 10-12" fans that could be used in an eveporative cooler I am designing. All the fans I have found so far are industrial fans or for computer cases. I also need to find a very simple plastic water valve. All I have found so far are large industrial valves. Again how do I find manufacturers that supply things like these.