I was changing my oil last night and notice coolant dripping. As I stand looking at the motor it was coming from the right side(drivers). It looks like the water pump(think thats what it is) between the motor and air cleaner. There is a round 1 1/2 inch connection to the motor and seems to be leaking there. First off, is that what this is if not what is it called? Then, is it a big deal to replace this myself?

Thanks!