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Nautilus P2.5 Uni-Dock Utility Center
Emptying the black tanks in the spring will ush
antifreeze out of the macerator system.
1. Turn the water pump OFF. Remove the plastic hose from the container. Leave the
black valve pointing to the clear hose.
2. Pour 1 cup of RV antifreeze into all sink drain P-traps.
3. To prevent staining, wipe the RV antifreeze out of the sinks, shower (or tub) and toilet
using a soft, dry cloth.
This will allow water to be drawn out of the fresh water tank using the pump (after the tank
is full) and into the water lines.
Refer to the 6 in 1 Utility Center – 2 Valve System section. Make sure the low point drains
are open to ush antifreeze from the lines.
In the spring when ushing antifreeze out of the water lines make
sure to set the (2) valves at the pump to the NORMAL position.