By the way, the black tank is easily visible behind the sliding basement doors, as is the control valve that drains the tank. While you are looking for the check valve in the water line, the black plastic line with the square fitting in front of you is the black tank drain line. Follow it upwards to the black tank.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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