Quote:
Originally Posted by sum escape
Off to the hardware store. Found a small crack in the fitting for the vent line to the holding tank. Problem identified, now just need to source the fitting and be a contortionist to replace it! Thanks all.
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That could do it. The rag test will just tell you if the hoses are permeated. If there is an air leak, then you are venting some of the displaced air from the flush into your boat. Not a permanent fix, but I would use some duct tape around the cracked fitting to see if that eliminates the odor issue.