difficult gate valve
The black water valve is really difficult to pull and push. So much so I'm afraid I'm going to break something working it. It is the cable system that runs from the handle back several feet under th...
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I have had the same problem with the black tank. I have found that putting about 1/2 a bottle of cooking oil in an empty black tank followed by about 5 full flushes of the toilet (approx 5 gallons). Then work the valve handle in and out as the oily water passes. This solves the problem for us for about 3 weeks (we fultime 4 months of the year) . Then repeat. It seems that the rubber in the gate valve hardens and isn't as slippery as it should be and the oil fixes it for a while
