I have a 97 geo metro that is leaking coolant at the tube where it connects to the back of the water pump I have taken the water pump off and all the associated hose's off the tube but cannot figure out how this tube is connected to the back of the water pump body is it pressed,crimmped,soldered??can I replace this tube?

Looking at a picture of the water pump, I cannot see a tube coming off of it. Where excatly does this tube go & what material is it made of?