[slrrls2000]

I'm just starting work on a challenger.
Looking in the bow (V birth) I see a large tank and two drain pipes.
Wonder if someone can answer my questions.
Facing forward to the bow of the boat the tank is in front of the two pipes.
Looks like a 10 to 20 gal I can't tell for sure.
Large pipe is on the left and smaller pipe is on the right.
The hose from the tank feeds back to the right and just past (galley way?). Then there is a large whole (hand size) in the birth with another drain pipe at this point.
My impression is that the tank is for drinking and flushing the toilet.
That a toilet would exit into the large drainpipe on the left while I'm not sure of the use for the drain pipe on the right. Then the hose that feeds through the galley way would feed to a sink that would rest at the large hand sized hole through the birth and that the drain pipe in that location would be for the sink to drain out.