Brochure shows 60 gals for grey water, so that would be 2 tanks. I'd look under the kitchen slide for a second valve. My trailer has the second valve just rearward of my slide (but a different floorplan). You may have to crawl underneath as any stickers might be gone.
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2010 Cougar 30RKS
2015 GMC Sierra Max Trailer
"Drinks for 6, Dinner for 4, Sleeps 2"
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