I have been having a terrible time with the electric dump valves on my 2013 27.5 Arctic Fox 5ver. The black tank valve has been worked on 4 times. Manually opened 3 times, replaced once at repair places. I have now opened it twice on my own. In talking with Dump Master they indicate that the valves have plenty of torque to open so I doubt if the discussion on the need to over lube is going to solve anything. Mine only takes a minor turn of the manual over ride and then the button will open the valve. Having owned 5th wheels (2) for over 15 yrs I feel that we do everything necessary for maintenance (chemical wise). So this is very depressing. I plan on having the valves removed and replace with manual valves. According to a maintenance person at one of the dealerships we have visited this is going to be a rather extensive job. I am tired of crawling under my brand new trailer and manually opening my valve!
Seeing as how we are on a rather long trip right now it has not been a positive response I have given to the several people that have asked me about my Arctic Fox. I do tell them we really like the rest of the vehicle, just don't buy one with the electric dump valves.