My 2015 37ND has 2 40 gallon grey tanks which drain separately. The front grey tank is for the kitchen and bathroom sinks (single bath) and the rear grey tank is for the shower, outdoor kitchen and washer/dryer if I were to install a set.
The front grey tank is the one that uses the same dump (separate valve) as the black tank.
I second the comment to get the drawings for the coach so you know for sure. Thor couldn't tell me how the tanks were plumbed and I had to investigate on my own.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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