Ours will smell if the water evaporates and it is a hepvo trap. They are cheap and easy to replace. If we're not going to camp for a couple of weeks we just pour a cup or so of vegetable oil in the drain. It won't evaporate and it helps lub the dump valve.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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