Quote:
Originally Posted by AZ Traveler
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 |
This is correct. If the "white lines" were for the clothes washer they would be red and blue like the others. The white lines (actually just 1 line that make a U turn at the back flow preventer) feed the black tank rinser and the reason it's there is to have a place for the back flow preventer. Some people replace a leaking one and others just remove it as you did. Not all "RV techs" know what they are doing. All 3 Montana fivers I have owned were/are like this.