We removed the OEM valve and use an exterior one when we flush. We also start the flush as soon as we get a good flow coming out the sewer pipe. That way we get everything to flow out.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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