Good Morning, Last time we went out, after hooking up to the sewer line at the campground, my black tank lever was super hard to open. Not sure why or what preventative maintenance can be done to en...
After emptying the tanks, with the handles pulled out, give the rods a good spraying with silicon lubricant. Run them in and out a few times. That should help unless the valve seals are messed up in some way. It always works for me.