Heater control valve?

heater cntrl valve.jpg

OK, so other than running one heater hose from the water pump to the fire wall and then the other the same. Where does this doohickey go? Yes, I called it a doohickey. As I help my friend and his wife put their wagon back together, un labeled parts and uncertain parts are falling out of every hole. I can't remember how it looks under the hood. Any one have some good photos or guidance.
Attached Images
Author: slant6billy