When I worked in auto parts here in Arizona,it wasn't uncommon to see aluminum water pump cores badly corroded,also something you need to watch on used intakes.Reason is in certain areas water may have a high alkali content so always mix your coolant with distilled or purified water and a quality anti-rust and water pump lube, Red-Line is a good choice.Now,heres a little off the wall cure,mix up some JB weld (not the quick dry) and put a thin coat on the new outlet inside and let it cure 48 hours before you install it,it does not corrode,should be the last outlet you buy!