black tank valve hard to operate
The black tank valve is hard to operate, and does not close all the way. It is about 1/4" shy of closing to where the clips will hold it in place. Also, the tank did not drain at first with the slinky, but with a Sani-con macerator, it seems to empty it. I am wondering if this is just a paper clog at the valve, or if the valve itself could be damaged. This is on a 2007 International model.
I tried backflushing from the grey tank, and flushed the system two times, but the valve still does not close entirely, and I am not conviced it drains freely.