Originally Posted by mr.ken
I read on another forum that many Georgetowns have 1 or more sinks plumbed into the black tank. Does anyone know if this is true, and if they plumb every coach the same, or it is floorplan specific???? I am specifically interested in a 2010 357QS. It has 41/41 for black and gray, but Im curious if they are sending any gray water in to the black tank.....
To be 100% sure if it's plumbed in, BEFORE you use the Toilet and get any waste in the tank, hook up a hose to city water inlet and open the black waste valve, turn on the sink and see if anything comes out of the waste line. It will drain almost immediately unless your out of level to the oppsoite side. If it does run out of the waste line follows NWJeeper's advice about keeping water in the trap.