Product review (4 stars): 100% official replacement (but made in Taiwan)
This is the new direct replacement for our new KitchenAide KRSC503ESS side by side fridge. When I pulled out the original filter, this is the same model of filter that shipped with the new fridge. So, yes, perfect fit and operation and meets the most NSF criteria of all the other filters out there. However, I'm taking off one star because it's made in Taiwan (a couple of steps up from China, but these really should be manufactured here or in Canada).