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Hi Jimmer
Had same problem on our 3402. As posted, ours was leaking on the black tank anti-siphon valve. The valve is a very poorly constructed piece of.........
Our leak always happened following a tank spray flush. I cut mine out during our trip. I did this in the basement compartment,[ to hard to do under sink] had my pex crimpers with me so two 1/2" 90 degree connectors from Lowes. I installed a check valve on the hose which I dedicate to the flush connector, to prevent siphon contamination to the park water system.
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