The reference to "link" in your request typically refers to the episode's title, "Flip Flop," because the plot revolves around a specific real estate "link" in the chain of buying and selling a house, or simply because you may be looking for a way to watch it.
The Reunion Awkwardness: Claire attends her college reunion alone to avoid explaining Phil's quirks to her former classmates. She runs into an old flame, Professor Cooke (Maxwell Caulfield), but things spiral when Phil surprises her by showing up anyway.
You can watch or find the episode through several major platforms:
Air Date: March 13, 2013