BB_TX wrote:
I have a Y fitting I install on the park faucet with a white hose to my fresh water connection and a green hose to my black tank flush. Each side of the Y has a shutoff valve. I leave the fresh water side valve open. Then I just open/close the flush side valve each time after I drain the black tank.
Same here but I don't leave the house hooked to the tank flush, it has a quick coupler on it and a spray nozzle goes on it to wash stuff.
Not only don't leave it on and walk away, don't even leave it connected.