Wow, this thread had me all paranoid that mine was plumbed in this unorthodox way, so I had to go out and look at it at 11:05pm...
. Fortunately, mine is plumbed correctly--I can open the gray without having to open the black, and vice-versa. Now I just have to decide if I want to replace my valves with electric or cable valves, as mine (esp the gray) are just way too far under the rig to get to easily.
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)25
2014 Harley Davidson FLHX (XLR cargo)
2014 VW Jetta TDI (diesel sipper, camping support vehicle)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)