I had to take the doors off my refrigerator to move it through a doorway. I put everything back together, but the part (picture below) that connects the freezer door's water dispenser to the fridge's water supply now leaks when I try to dispense water.
What is this part called?
Is there a trick to reattaching this piece that would prevent the leak?
If I've damaged the piece, where should I find a replacement?