The Cross section of the decanter shows the side wall of the decanter; the weir with the locking rod attached to the top lip; trap door and foam barrier. In the first picture above on the left the decanter is shown as if to be floating with the out side and inside water level being the same. The level out side would be 2” down the foam barrier. On the inside the water level will be the same; above the tip of the weir. The weir is hollow and will float on the fluid on the inside of the decanter. The is how the inside of the decanter will look when the control valve for the decanter is closed.