Help on identifying leaking part

[config]

I have a slight leak on this part but I don't know what it is. I attached a pic of the part in question. Can anyone help identify this part? Thanks!

 

[Turdle]

That is the coolant bypass valve.

It allows, or stops,engine coolant circulation through the heater core.

 

[dogfriend]

Sometimes called the heater control valve. They tend to leak. Costs about $15 to $20.

 

[config]

Great, now I know what to purchase - Thanks!