There's three lines in there, grey, pink/purple, and a "whatever" line. The pink/purple line comes from inside the car to the vacuum ball, then the "whatever" line goes from the vacuum ball to manifold vacuum(?) on the engine and the grey one goes from in the car to the heater control valve.
Here's a diagram, I can get pics of my car's setup tomorrow, but it's definitely pink. I have the broken piece in my garage. The piece coming from in the car to the ball is broken. I'm not opposed to replacing it. I may just cut the ends straight and tape em together lol.
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