That is the drain for your galley tank. It is often overlooked by dealers as well as buyers. It is rather important to dump that tank also, unless you do not use the kitchen sink!!!
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are
blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.