I don't have a NH toilet and don't know what I'm talking about.
Seems to me if I was plumbing a sewer line to a sewer holding tank, I would incorporate a trap in the line, even if it was a 3/4" hose. Just a little sideways "S" in the line somewhere. That would seal off fumes from the tank to the NH canister.
David
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WBCCI #8607 VAC Region 11
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