Gray water tank

[Carl n Susan]

I have a friend who had the same symptoms on his SOB. It turns out the downstream side of the gate valve was leaking. It was fine as long as the valve was closed, but once it opened, it would leak.

You don't say what model and year Montana you have but those with the dropped frame make it easy to access the shower tank valve. There were several postings on this subject in the last few weeks. They related to the black tank but the shower tank is next to it and the same principals apply.