In our Cougar, both gray tanks are definitely tied together. Two handles, one for black, one for gray, along with two drain pipes, one black, one gray. When dumping the gray tanks there is an initial rush of water for 30 seconds or so, a pause and then a second surge. Once done, both gray tanks are empty. We were lucky enough to get in more than 30 days last year, so I know both gray tanks emptied or we'd have a major flood someplace!
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Jim
2018 Cougar 32RLI
Hercules H-901 tires
CRE3000 w/wet bolts
2021 F-350 4x4 7.3L Godzilla Crew Cab
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