Boy Howdy ... you are having your fair share of issues with this ole gal. You can drop a short section of one side of the belly under the tanks to get a look. It will be either a 3" or 1.5" gate valve "if I understand your leak". You should replace the gate valve assembly with seals itself (4 bolts, the pull cable, and it's out) but you don't have to cut any fittings to do it. There is no "gasket" that I'm familiar with. Later model Montanas have two 3" gate valves on the grey and black tanks facing each other between the two tanks ... 1.5" gate valve on the galley tank ... I'm not sure what your 2000 model has.
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