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2002 FV 342 on Lake St. Clair - Past Commodore SHC - Vessel Examiner USCGAUX
There is a threaded adapter that screws into the pump out opening. The pump out will have a hose with a fitting that locks onto the adapter.
The Third “B”
Ravena Coeymans Yacht Club
Boat Name: King Kong
"Boat + Water = Fun"
Just make sure you have a suitable breather ... otherwise the tank will implode when sucked out.