The red capped things are 12 volt circuit breakers to usually the tongue jack, stabilizers or other 12 volt items on your rv.
As for the grey tanks, NO they are not connected together, they fill separately from wherever they are plumbed to kitchen or bath. You can however purchase a twist on valve to install before connecting your sewer hose to the rv & by keeping it closed you can open both grey valves so that they will equalize, be sure to keep black valve closed when doing this & to close both grey valves before dumping the black.
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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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