Marquis 420 Sport Coupe Owner's Manual page 71

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Overboard Discharge
DC Control Center
Waste Pump Breaker
When the waste tank is empty, turn the overboard discharge pump OFF.
Operating the pump when the waste tank is empty can damage the pump.
To empty the tank
3837• U3 10/07
In certain coastal areas of the world it is legal to discharge the waste
from your boat's waste tanks into the sea. To accommodate this procedure
Marquis offers an optional overboard discharge system for your boat. This
system is available only on boats that are exported or used in the coastal
areas of the United States.
With the overboard discharge system, waste is flushed from the toilets
to the waste tanks where it is stored. Where it is legal, you can then empty
the waste tanks directly overboard. If overboard discharge is not legal
where you are, you can either wait until you reach an area where it is legal
or use a dockside pumpout station to empty the waste tanks.
1. Open the overboard discharge seacock located at the transom bilge
area.
2. Provide power to the circuit breakers on the DC Control Center - Engine
Room. Switch WASTE PUMP circuit breaker to ON
3. Turn the overboard discharge pump switch ON. The switch is located
near the overboard discharge seacock. This activates the overboard
discharge pump, which pumps the waste overboard.
https://www.boat-manuals.com/
Transom Bilge area
Seacock
(shown Open)
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