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Not to be a smart alec or anything--but can someone explain the easiest and safest method of cleaning out the black tank?? I don't know much about physics or PSI or pound /square mm.etc (LOL). When I empty my blcck and grey tanks and put the cap back on---the next time I take the cap off to attach the "******* " hose as my wife calls it about 3 gal of nasty stinking sewer water comes out-----does that mean the gate thing when I push it back in isn't completey closing off the black tank and it's defective???
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