I had my black tank drain valve leak by, removed both valves. could not get them back into place. Being black and gray tanks side by side and ridged. I remove 1/4" of the neck on both tanks. replaced the old hose clamps. turned both valves around 90*. reapplied the plumbers putty. But what I found inside the tanks was a foot long piece of dried glue. and broken off pieces of glue. as well as glued splattered on the valves themselves. So now both valves hold and if I was to replace the valves it would be easy next time.
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