Product review (3 stars): Not quite direct replacement
Ordered 5221JA2011J and received AJU72992601. Was told that is the LG replacement part for the original, even though AJU72292601 has two solenoids instead of just one. (The part didn't come with any installation instructions.) When trying to separate the two pieces to AJU72992601, ended up breaking off the end of water connection inside the piece needed. After nearly giving up and ordering another, figured out how to push back the metal fingers inside the connection just enough to grab the piece that broke off with a pliers and pull it out without doing significant damage. The water hose to the refrigerator was then able to make a good seal and everything now works as expected.

Separating the two solenoid pieces was the hardest part of the install (same with removing the hose from the unit already installed).  Otherwise, it is very quick and easy.