myredracer wrote:
When we had the same thing happen our last TT, we had serious ongoing trouble getting the tank to empty because of a similar glue issue. We could only get the tank emptied maybe 50% at best. Didn't matter how much we backflushed, used the tank rinser or anything else we could think of including getting the tank pumped out. The tank would be full again in less than a day and backing up into the toilet.
Not going to happen this time. :)
Excess glue from fittings was not your problem in last TT.
Sounds more like the 'cut-out disc' (installer cuts holes for vent, drain, dump lines) was not removed from tank and when you drained tank it got stuck in drain opening blocking off drain line.
Those discs have to be removed by hand.