To be sure that you get a water pump for 3 cylinder 2000 rather than the earlier 4 cylinder 2000, make sure that the listing says that it is also for a 3000, as they both used the same water pump and there was only ever the one 3 cylinder model called the 3000. The 3 cylinder 2000 and 3000 tractors are almost identical except for a few small differences. The 3 cylinder engines used the same water pump for both gasoline and diesel models. It looks like YT sells two of them that claim to be correct for your tractor, one with the back housing already installed, and the other without, so you swap the back housing from your old one to the new one, for about $13.00 less. They both come with the gasket:Water Pump with back housing and gasket. Water Pump with gasket but without back housing.