No idea what a black one might be, but that small white tube drains the fridge into the small pan you see. It can get clogged with algae, lint or ? so it is a good idea to check it from time to time to make sure its clear to drain. It brings the drainage into the cup near heat from the fridge so as to let it evaporate.If clogged, it will cause the drainage to spill over from the collection pan under the freezing coils inside your fridge, making a wet mess inside..rgr...
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2004 Winnebago 33V, WH
2010 Honda CRV
Jim, Lynda, and our 6/2010 model Weimaraner, Quincy, aka Q Man
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