Thanks for all the comments. That Valterra valve looks like the answer. I had told my wife before that was posted that I thought I could make something similar but not that cheap. I looked under the bottom of my wet bay and there is no access panel there. When it gets warmer I will drop the control panel in the wet bay to see if the cable and valve can be reached but from what I can see under it that will be a lengthy reach at best. The add-on valve could be a long term solution to the problem and easy to keep clean, too. You can watch the video but not on Google Chrome. It is very educational about valves, not just the add-on part.
