Unable to identify what part is this. Coolant leak

Hi all, i am currently having coolant leak on my 2012 Toyota Prius V and i think i have found the culprit. But would require some expertise here. Anybody, know what part this might be? Initially, i thought it was the water pump or ac compressor but not sure if that is correct since it looks like the water pump is connected to this unit.

 

Thanks! i think it might just be the pump or thermostat. Will be changing out the water pump and thermostat since there a P148F code and see how it goes from there. Hopefully, it fixes this coolant leak

 

Fixed the coolant leak issue after changing the water pump and thermostat. But heater still aint working, probably need to do a reverse flush for the heater core.

While i was at it, cleaned out the intake manifold, throttle body, egr, replaced PCV and spark plugs. Car runs smoother now but not sure is it a placebo effect.


Followed this thread for the cleaning!
Prius Gen 3 Major Maintenance: EGR, manifold, spark plugs, Oil Catch Can | PriusChat