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.
I had a similar setup and would stop the water flow with the hose valve so there was no chance for backflow which would be possible if you turned the spigot off with the inline hose valve open.
with the black tank rinser I did not have to "nearly fill" the black tank as the sprayer pushed the stuff towards the drain.
bumpy