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Chris, it sounds like you may have one of the tank cut outs sticking in the dump pipe and when you dump the tank it only goes so far before the cutout piece flows over and blocks the dump pipe. This has happened to several folks. The individual that cuts the hole in the top of the tank for the Toilet pipe lets it drop into the tank and doesn't take the time to remove it. We have an 08 340RLQ Big Sky which is the same as the 3400. We have had to replace one black tank because of a rupture in the bottom but have not had this problem yet. We are more or less full time and do use the system a lot. This the only explanation I can come up with. When you dump the black tank try stopping the dump just as it starts to slow down. Close the dump gate and let the flush fill it a bit. Then open the gate and see if you get a heavy flow for awhile. What usually happens is the disk gets into the opening to the dump gate and lays there until you pull the gate handle and then slams shut after a you start dumping. When you used the plunger with the gate open you probably sucked it back out of the hole so all worked for awhile. The only way to get it out is to remove the dump gate and hope it is still in the pipe opening so you can grab it with a pliers and yank it out... Dave
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