Just discovered this item under the floor of my boat. We own the boat for 18 months and thought I knew it all haha. Hope the TF brain trust can figure it out. Thanks all.
Both of the above are possibilities so need more info to be sure...
Do you have an air horn?
Can you tell or guess where the black tubing from top is headed / connected to?
Is the metal unit below the tank connected to the tank & appear to be part of the system? Is it connected to the 12V system? If you have an air horn have someone activate it and monitor the unit to see if it cycles on/off
Just discovered this item under the floor of my boat. We own the boat for 18 months and thought I knew it all haha. Hope the TF brain trust can figure it out. Thanks all.