So on yours the two gray tanks are connected by the drain pipe?
That is correct. The gray valve is on the main drain pipe just after the second tank joins so the 2 45gal tanks equalize to create the 90 gal gray.
So on yours the two gray tanks are connected by the drain pipe?
That is correct. The gray valve is on the main drain pipe just after the second tank joins so the 2 45gal tanks equalize to create the 90 gal gray.