The 3901 has a gravity and an electric toilet. That's because it has two toilets and one black tank. The gravity would not bee too much to replace with a taller unit. replacing the electric toilet in the rear bath may be pricy.
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Brenda & AL
2017 Thor Venetian, T42 "Groot"
2020 Chevy Sonic, 2019 KTM 790 Duke
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