One sure fire way to determine what empties into each tank is to empty all tanks, close the dump valves, then begin by pouring a couple gallons into each sink/shower/toilet (one at a time) and pulling handles until you get a return. That will tell you what drains where and which valve attaches to which tank.
Then, if you want to know the size if each tank, get a 5 gallon bucket, start pouring into each tank until it's full, if you counted the buckets correctly, you'll know exactly how many gallons are in each tank.
Unfortunately, Keystone (and most other manufacturers) only give the total size of the RV capacity without regard to whether there are two, three or more tanks in any given category. So when they list a 90 gallon gray capacity, it may be one 90 gallon tank, two 45 gallon tanks or three 30 gallon tanks or any combination that gets to the 90 gallon total. Use a bucket and count till full, then you'll know.
Seems academic and I wonder why we should have to do that when Keystone installed the tanks and it would be so easy to list them on a data sheet in the RV, but that doesn't seem to happen.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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