pitting in thermostat elbow

[A. Brown]

changed the thermostat at last coolant change and noticed some moderate pitting in the elbow connector that fits over the thermostat. Makes sense to me that it would be a prime area for cavitation, will probably change it altogether in another 30k. anyone else experience this?

 

[TowPro]

cavitation would not happen in this location. Here is a nice read I picked up a couple years ago from somebody on one of the diesel lists. Check it out, it explains why cavitation happins. Cavitation