My new 2017 Heartland Mallard M312 has 2 sewer hookups. The one on the left has 2 release valvues and the one of the right has one. How am I supposed to know what valve is the Black tank vs the Grey 1 & 2?
Hopefully some of our other Mallard owners will jump in soon with some info for you. But if you can see your valves the one that is 3" will be the black tank and the other is maybe a 2" or 1.5" will be the grey tank.
On our 2018 Mallard, there are yellow stickers identifying gray vs black on the lower portion of the side wall panel. We only have 1 sewer hook-up. I will try to remember to get a picture when I get home.
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