You will need a clear fitting put on your sewer hose to be able to watch what's draining.
With 3 valves you should have 2 grey tanks; 1 bath, lavatory/shower maybe washing machine & 1 kitchen/galley plus 1 black tank for the toilet, some may have a sink or possibly the shower draining into the black, but if it has a toilet draining into it's always dedicated as a black tank.
The color of the handles has nothing to do with the tank it may be connected to, if by chance it happens to match it's purely accidental.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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