Product review (4 stars): If this is your first replacement. Read this.
This was the first time I had ever changed a filter cartridge. This cartridge fit just as well as the factory cartridge which was a DA-00020 A/B. The factory cartridge had a round hole where this one is a square hole. I have read reviews where people claim a square hole causes leaking when your original cartridge had a round hole. This was not the case for me.

When I ran the water, it would sputter about every 4oz. This led me to think the cartridge was bad. Also the water, as yet to be chilled, did not taste very filtered. These two perceptions led me to set this order up for return. Unfortunately, I had made an error. While waiting for my replacement cartridge, the sputtering stopped and after the water was chilled, it tasted just like it should.

So, if this is your first replacement, and it is not leaking, run at least a gallon of water through it and give it a few days and it will behave just like it should.