[jeepjrn]

Originally Posted by kowbra

I don't know about prior years, but the 2021 models use a 1 piece rotocast tank...
https://www.keystonerv.com/innovatio...-wheel-chassis

And, as to manufacturer recommendations, do you have info on where Keystone is not installing properly?

Thanks,
Brad

When on tour at the Montana factory last year during the MOC rally, I definitely recall them telling us that they now use all one piece tanks. If your coach is newer with a one piece tank and the sewer line is properly sealed and secure, the water/sewage should have come out the roof vent.not into the underbelly. That “pop” in my opinion was most likely an improperly sealed/secured sewer line to the tank. If indeed an older coach with a two piece tank, as already mentioned the top of the tank where the seam is could have split open as many suggested.