If you put the high point in the exhaust hose as soon after the waterlift as possible you will minimize the backwash into the waterlift when turning the engine off.
I'd be interested in learning what features of the Vetus LP40 factored into your decision to use it.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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