I've only used them when the black tank valve has failed and the poop started to mound before I could replace the bad valve. It worked great for that and so should work even better when it's not fighting a mound.
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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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