Many rigs, ours included, don't dump the washer in any tank. If you are using the washer, you must be hooked up to a drain, and the waste water goes directly out the drain hose. For your rig, it might be easier to just have both grey valves open when doing laundry, and not worry about which tank does the washer.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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