low point drain: how to open
Hello, and thanks in advance for your help for me, here at the bottom end of the learning curve. My 2008 (new-to-me) Cruiser Funfinder apparently has low point drains with some kind of way to open them from inside the trailer (on the outside under the trailer, the red and blue pipes have no caps, just open to air). This is what it looks like. I've twisted and tugged a bit on the rings but without figuring out what I should be doing. I'm reluctant to tug harder for fear of breaking something. HOW do I open the low-point drains?
__________________
|