I have not measured the capacity of the grey tank, it does seem correct. Mine does not backup into the shower even when indicating full. Unlike Travelin Texans it takes several minutes to drain the last 1/3 of the tank to get the empty light on...
The tank is large but very flat, with the drain more at the front than on the bottom???. It would drain easier if RV is slightly nose down and may not drain completely if nose high.
Since the tank is forward of the bath, it may backup to the shower sooner if the RV is slightly nose up. Or if the shower drain pipe goes uphill to the tank. Dealer should be able to check that..
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U.S. Coast Guard retired- 1956-1985
Pensacola, Florida
2016 Siesta 24ST
1972 Moto Guzzi Eldorado
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