I believe that vents the sink traps. I've had soap bubbles come out of there before when we had some excess Dawn in the kitchen sink.
It looks like Tim pointed you to the correct replacement.
Dave
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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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