G
PLUMBING
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DRAIN AND WASTE SYSTEM
The drain and waste system of your
motorhome includes either a combina-
tion gray/black waste holding tank (Rear
Bath) or separate grey and Black tanks
(Mid Bath) made from molded plastic.
The tanks enables you to use the toilet,
sink, and wet bath drain for several days
away from disposal facilities. To empty
the tanks, attach the sewer hose by
pressing the bayonet fitting onto the
outlet adapter and rotate clockwise until
it feels solid and secure. Attach the outlet
end of the hose to the sewage outlet; making sure that the hose is placed so that it
will drain completely.
The tank on the Rear Bath model has an
electric dump valve with a remote switch.
The switch is located inside the rear cargo
doors on a panel beside the spare tire. The
switch activated an electric solenoid that opens the valve. Push and hold the switch
until the tank is empty. Release the switch to close the valve.
There is a manual override for the electric system for the electric valve located on each
side of the valve. It is flat head screw that is turned clockwise or counter clockwise
according to side you access to open and close the valve. The direction is labeled on
the valve.
The tanks on the Mid Bath model have two manual dump valves located under the
motorhome on the drivers side below the refrigerator.
Watch all connections while dumping and release switch if a leak is noticed.
When Parked and Connected to Sewer Outlet
When you are in a park, and connected to a sewer outlet, keep the tank dump valve
closed and empty the tank every few days or whenever it becomes almost full. ONLY
BY SENDING A LARGE VOLUME OF LIQUID THROUGH THE TANK AT A TIME WILL
TOILET PAPER AND OTHER SOLIDS COMPLETELY WASH AWAY.
This practice will avoid the accumulation of solids in the tank, which could lead to an
unpleasant cleaning job. Should solids accumulate, close the dump valve, fill the tank
about half full with water, then drive the motorhome for a few miles. The turbulence
and surging of the water will usually dissolve the solids into suspension so the tank
can be drained. Keep the auxiliary tank valve open when connected to a sewer outlet.
Draining the tanks as described will protect them from freezing during storage. Use a
winterizing solution designed for RV use after draining tank.
Heated Tanks
The Interstate motorhome has 12-Volt heat pad installed with the gray/black combina-
tion-holding tank on the Rear Bath and gray tank on the Mid bath model. This pad is
controlled by a switch located next to the monitor panel. To conserve battery power,
RV antifreeze may be used to protect the tank. Battery power will last about 6 hours
unless the unit is plugged into a 110-volt shoreline source to operate the converter/
battery charger.
CAUTION: Never put wet strength paper towels or tissues in your holding tank,
since they won’t dissolve and can “catch” in the mechanism of the dump valve.
Colored toilet tissue is slower to dissolve than white. Most RV accessory stores
offer tissue, designed for RVs that will completely dissolve.