You have a gray water tank for the kitchen sink and another one for the bathroom. Your dealer during the PDI should have explained this in detail. The black water drain pipe is a 3" pipe. It may or may not have a black handle on the knife valve depending on the installer. ALL gray water drains have a 1.5" pipe coming into the knife valve. The color of the handle should be gray or black; hopefully, a different color from the other, but never say never. Some coach designs have an intermediate knife valve located near the outlet for the rear gray water tank in the rear to prevent water remaining in the line after draining (you don't want the drain pipes to have water in them in freezing weather. Hopefully some one who had a thorough PDI with an ACE 27.2 can explain it all to you. By the way most wye valves swivel up and down. The outlet is stiff but can be aligned with the hole in the bottom of water bay.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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