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Originally Posted by RayChez
I guess the class C has a different type of dump valves then the class A. My class A coach has about a four inch dump valve for the black tank and about a two inch for the grey. They are sixty five gallon and forty five and I can dump them in about a minute.
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What the OP is talking about is this -- when they drill the large hole in the tank for the valve, they use a hole saw and sometimes the big plug falls off and into the inside of the tank. In his case, they just left it in there. Eventually, it works its way back to the valve opening and sits there blocking the valve.