Rita,
The black valve is a back flow preventer for the black tank flush system. This is a common problem and you will only note the leak after using the black flush. You can replace the valve with a more reliable brass valve.
Here is a similar thread: https://www.montanaowners.com/forums...+tank+backflow
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
|