Product review (5 stars): Good Replacement Water Valve
Seems like the tiny rubber o-rings on this factory part are only good for about 10 years.  Interesting that the mfr. did not situate this part above the nearby water tray.  I rigged a plastic funnel cut from a large plastic coffee container (Folgers I think) under this unit so that any future leaks will run into the water tray.  At any rate, the part was easy to replace on my Whirlpool fridge and does not leak after installation.  The price is much better than most other parts suppliers.