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The is located underneath
the external hose storage box. This bypass will allow
you to gravity dump the waste from the tanks straight
down to a 3-inch sewer hose connection under the trail-
er, in the event there is a problem with the macerator
motor.
1. Attach a 3-inch sewer hose to the main dump
connector under the trailer and to a sewer
outlet at a dump station.
2. Open the desired black / gray (manual) drain
valves, one at a time (black then gray).
3. The macerator bypass valve will be pointing
away from you and is attached to the mac-
erator pump. The valve location is by design
to prevent accidentally engaging the bypass
when system is operating normally.
4. The bypass valve is normally open (handle is pulled To bypass the macerator,
push the bypass valve (turns o ow from the macerator pump) allowing waste to
ow out of the dump connector under the trailer via gravity.
5. When nished, close the main dump gate valve under the trailer, along with the black
/ gray dump valves. Disconnect the sewer hose from the main dump connector and at
the dump station.
The bypass valve also doubles as an emergency cutoff in the
event of a problem with the ex hose or dump connector. Closing the valve
stops waste ow out of the macerator pump and up to the ex hose, but will
divert waste to the main dump connector under the RV. Make sure the main
dump gate valve is closed until you are ready to empty the black tanks.
Black Tank Flush (if so equipped)
The black tank ush (no fuss ush) inlet is typically located on the utility center panel la-
beled as “Tank Flush”. The location may vary depending on your model. Attach a garden
hose (connected to a pressurized fresh water source) to the black tank ush inlet. The water
goes directly into the black water holding tank sprayer connection, allowing you to remove
debris and preventing accumulation. A check valve is incorporated in the plumbing lines to
prevent back ow. Flush the black water tank each time the grey and black water holding
tanks are dumped or as needed.
The color-coded valve positions do not affect the tank ush func-
tion. It does not matter where they are positioned when operating the tank
ush. Refer to the Uni-Dock Utility Center
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