Maybe I just don’t understand the OP’s concern but we just make sure the seal is closed after flushing, then lift up on the foot pedal to put extra water in the toilet bowl. Black tank odors in the coach isn’t normally a problem as long as the seal is closed properly and additional water remains in the bowl.
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2004 Itasca Sunrise 34D, 8.1L, Workhorse W20 Chassis
2023 GMC Canyon AT4, NSA Ready Brute Elite II, BlueOx Base Plate
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