Replacing Cable Waste Valves

I found two issues with the dump valves. First, the way they are made, debris can flow back into the cavity next to the blade when the valve is open. The other problem I found was the shaft seal swells and creates too much drag for a cable to push it closed. I currently have new valves and cables that I installed with added tubing so that I can lube the valve easily.

The answer may be the electric valves, but the switches apparently are not made for outdoor use and are not designed for a travel trailer. I will try to come up with a switch solution if I have any more cable valve problems.