Just bought my 2018 Cougar 32 RLI (loving it) last week after trading in our 4 year old Jayco 318RETS. I was told by the dealer that one drain was black water (on the left) and one grey drain (on the right) for both grey water tanks. After draining both on the trip home, I checked the control panel and both the grey tanks showed empty, so I suspect that there's no separate drain for the second grey water tank.
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