[bestgenman]

Richard, yes it is associated with the Aqua Hot.  It is the liquid recovery tank.  I removed the tank that relied on a negative pressure or suction to pull the liquid back into the Aqua Hot.  I was always fighting small vacuum leaks that over time left the liquid level low    First it was poor quality caps, then a split neck ( fixed with Roger Burke’s machined aluminum replacement ), or hose leaks suffering from the high temperature.  Now the tank is above the Aqua Hot.  Any issue now will display as a liquid leak.  In the past, the hose has been changed to high temp products such as Teflon.  That was fine but too stiff.  Now there is a short piece of tubing with the consistency of latex but with a higher temp rating at the neck.  This serves as a pinch point, if needed, in the event the cap needs to be removed.  

This whole project is a work in progress in the event “bugs” develop.  So far it is working flawlessly but time will tell.  Here is another picture at the neck area.
   

The tank prior to installing