Coolant "return pipe' leaking on 4.8IS

[SocalD]

Hey all. I had a leak coming from the short rubber-coated return pipe that connects between the water pump and the coolant neck on the valley pan. It was because the rubber was cracked and peeled somewhat on the old one. I replaced the tube with a new one and it was dry for a few days but started a small leak exactly where I had the last leak; the bottom of the tube where it meets the valley pan neck. Getting frustrated, what could it be? I did not by an OEM part, could that be it?