04-09-2019, 05:29 PM
Assume you have a vac-u-flush system on your boat. If so I suspect the "duckbill valves" are leaking causing a vacuum leak... I've attached a diagram to show where they are.. The duckbills get clogged/old after several years and no longer seal as intended.. As a result they leak preventing the system from holding a vacuum.. Replace is my suggestion... M2C


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