It can't back-up into k-sink it would over flow from the toilet rim first lowest point of gravity the sink is apprx 36 inches above floor and in your house if on a septic tank everything flows into it whats the difference, EPA (grey)holding tank less pullution
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2007 TourMaster T40B -Mercedes MBE
toad=2007 CR-V
trailering= mc Honda VTX1300R, Shadow Aero 750
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