Review on 🚽 Valterra T1020-1 Black Waste Valve Cap - 3-inch with Capped 3/4-inch GHT by Buddy Camaney

I have this on both of my gray water tanks in my RV. We call it a "cheat valve" because you can dump gray water without pulling out your nasty sewer hose. It's very discreet, and when you want to drain greywater, it just looks like your water hose is there. I would make sure you use a different hose than your regular water supply hose as it will and won't contain soap residue. Although most water is naturally biodegradable.