If this is a new trailer, there could be a piece of plastic from when they cut the opening for the waste water inlet stuck in the blade valve preventing it from moving. It may or may not possible for you to do, but one option is to shove a water hose up through the waster water pipe and try to dislodge whatever it might be, who knows. I had a piece of plastic stuck in the macerator pump when I dumped the black tank for the 1st time.
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2018 Ram 5500 with 2021 Arctic Fox 1140
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