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I guess I've lucked out. I usually flush my black water tank with the drain open but I close it for 30-60 seconds and repeat this process several times. However one time I got distracted and left it closed for a lot longer than I should have. I turned off the water and opened the the drain. OMG, the flex hose sprang to life, came out of the ground connection and sprayed all over the place. Reminded me of a fire hose that nobody is holding onto whipping around. I thought most of the pressure would go up through the vent pipe but it surely didn't. Glad I didn't try and flush the toilet at that time because I'm sure there was pressure behind it too. I still do this cycle but am cautious on how long and even short cycles now I make sure I have the ground connection secured because it still seems to release pressure. Knowing now how these tanks are made I may not do that anymore.
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