2020 Imagine 22RBE Gray Tanks Capacity

[DiverDavid]

I just picked up a new 2020 Grand Design 22RBE yesterday. It has two gray water holding tanks. One is for the kitchen sink and the other is for the bathroom. The dealership did not know the capacity of each tank. Does anyone know? I am hoping the one for the kitchen is smaller giving more capacity to the bathroom. Thanks in advance!

[howson]

I just picked up a new 2020 Grand Design 22RBE yesterday. It has two gray water holding tanks. One is for the kitchen sink and the other is for the bathroom. The dealership did not know the capacity of each tank. Does anyone know? I am hoping the one for the kitchen is smaller giving more capacity to the bathroom. Thanks in advance!

I went to Grand Design's Parts Lookup website, https://www.granddesignrv.com/owner-...y/parts-lookup, and punched in your year and model of trailer.

Then I selected Plumbing.

Under the list that returned there are three tanks listed.

One is 44 gallons https://www.granddesignrv.com/owner-...s/detail/43868 I suspect this is for the shower/bathroom sink.
One is 36 gallons https://www.granddesignrv.com/owner-...s/detail/48854 I suspect this one is for the kitchen sink.
One is 37 gallons (I think this is the black tank) https://www.granddesignrv.com/owner-...s/detail/46893

You didn't ask, but here's a "trick" to make the gray tanks one big tank: add a twist-on Valterra waste dump valve to the end of the dump plumbing. Keep the Valterra valve closed and open the two gray valves (for the kitchen and bathroom) and the two tanks will equalize as they fill, becoming one big gray tank. (If you get a Valterra twist on valve, don't forget to get a cap, too!)

[DiverDavid]

Howard,

Thank you for doing what I probably should have been able to figure out myself. I am new to this forum and still stumbling my way around. You read my mind. I had wondered if there was a way to combine them. Will definitely check this out.

Thanks again!
David