Have you had problems with the value/handle line which is wound in a circle one time between the waste value and the handle getting hard to open and close when draining the plumbing? I don't really know how to explain, but it seems that when I go to drain the tanks, the values have not been closed completely as I get gray water immediately when opening sewer cap. I really push on the handle hard to try and seat the value, but to no avail. It seems like there is too much give in the line between the handle and value for it to close properly. So sorry! Does this make sense?