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It is the black tank release valve. Keep it closed while traveling it keeps the weight of the stinky stuff out of the cross pipe so it does break I guess. On the drivers side there is 3 valves one in front is for the washer dryer combo. One on top is black tank the last one is Grey.
Basic rule on the black tank is keep it closed until it is time to dump. Leaving it open will lead to the "brown pyramid of doom".
__________________ Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot
fyi, washer drains directly out, not to the gray tank. Id recommend running a load and watching it carefully at the beginning. My inline anti siphon was twisted up by installer, water quickly came out on the floor until i fixed it .