In our trailer we have separate holding tanks and drains for the grey water and the galley water from the kitchen.somebody told me that I don't have to worry about over filling either tank because there is an overflow connection between the two tanks. This doesn't seem right to me and I don't see a pipe between the tanks. Any thoughts?
No built connection between our two grey tanks either. Had the shower fill up through the drain while tank 2 was empty to prove it. Two ways around that. Leave the cap on the black/grey drain and open both grey valves (keep the black shut. The grey water then cross feeds through the manifold. Bad part is when you close all valves and remove the cap, you get about 12-20 ounces of grey water on the ground. Better...they make a second blade valve that attaches to the bayonet fitting allowing you to open and close the grey valves with impunity and the ability to attach the dump hose at will without spraying grey water all over.