Fluid leaking
 

I circled the part in question. When the car is running a liquid is leaking from this part. I believe it may be antifreeze because my antifreeze keeps getting low. Used two bottles of antifreeze since last friday. I've checked the oil and their is no antifreeze in the oil. What else should I check? What is the name of that part I have circled? Thank you in advance for yalls help!