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I have owned 3 fifth wheel trailers over 17 years without a blank or grey tank dump valve/cable failure. My 3rd trailer, a 2020 Montana 3780RL, began to have blank tank dump valve opening issues starting 6 months after I purchased her. Fortunately I had the foresight to installed a Camco 3-inch Sewer Gate Valve with cap Built-in Clear Adapter 3-inch Sewer Fittings | Ready to Use Construction (39053) immediately after I purchased her since the black tank dump valve would not close after 17 months. I Just got it replaced at a local RV repair shop this month. $55 part and $400 labor covered under my extended warranty with Compass. What a relief!!
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