Originally Posted by dkwin1
Have a 2013 320rs. Which valve is the black water tank (the waste water or the sewer water valve). Have had this unit for 8 months and still cannot figure it out. Boy oh boy.
If your facing the water compartment you see two handles for cable actuated dump valves (I could be wrong about the type of valves). Directly behind these handles are two side by side tanks. The closest (Port) tank is the Black Tank and the Handle Control is the right most one (closest to the Stern). The far tank (starboard) is a Grey Tank and the Handle Control is the left most (closest to the Bow) for bathroom sink and shower by themselves. The Handle located under the unit next to the 3" dump pipe / hose attachment point is a straight rod controlled valve that is a Grey Tank for the kitchen sink (galley) and washing machine by themselves. This tank is located to the right of that valve and spans across the 320RS. (BTW there is a "Galley" label in my water compartment but that is incorrect). The rear most (Stern) tank is the fresh water tank and spans across the 320RS. When the kitchen / washer Grey tank is full water rise in the kitchen sink. When the shower bathroom sink Grey tank is full water will rise in the shower. I have been looking for the leak source that is soaking the insulation under fresh water tank. And it is NOT from filling these tanks full.
I've read you should keep the Black Tank Valve closed until 3/4 full as indicated by testing the level inside the control control box. It may be a good idea the keep grey valves closed to until ready to dump prevent sewer gases from entering the grey tanks.