Hello, New at this RV'ing thing. Just got our used 311 FS and are totally digging it. However, when crawling under to look at the waste piping, everything looks straight forward to me. The small pipe with grey handle comes out of what I perceive is the waster water tank, and the larger pipe with black valve comes from a smaller tank which I perceive to be the black tank as it's pretty much under where the toilet is. Then there is another large pipe (3") that comes out to a black valve. But tracing this pipe back, it disappears into the belly of the coach. I'm seeing on here that the washer/dryer combo doesn't drain into a tank? Is that correct? Also, why is there a larger pipe and black handle? I thought the larger pipes/black handles were for black tank wastes. That's why I'm perplexed on this. Would like to verify this, so if anyone can help, it'd be much appreciated.