THOR MOTOR COACH
WATER SYSTEMS
71
Emptying the Holding Tanks
1. Remove the sewer drain hose from its storage compartment on the side of the coach.
2. Remove the cap from the sewage drain, and connect the drain hose to it.
3. Attach the other end of the flexible drain line to the dump station inlet. Make sure both ends of
the flexible drain line are securely attached.
4. Drain the black water tank first by pulling the termination valve handle toward you. Make
sure to allow sufficient time for the tank to completely drain, then rinse the tank with several
gallons of water by depressing the stool pedal. Close the valve on the stool and let it fill before
releasing the tank. This creates additional force to flush the tank more completely.
5. Drain the gray water tank by pulling the termination valve handle toward you. Draining the
gray water tank last, with its soapy water helps to further rinse the drain and flexible hose,
6. When tanks are emptied, close termination valves by pushing handles back to closed
positions.
7. Remove the flexible drain hose and wash it thoroughly with clean water. Remove the other
end from the dump station inlet and replace it in its storage compartment. Secure the sewer
hose storage cover, and replace the caps on both the motor home outlet and dump station
inlet.
The following guidelines will help to ensure trouble free operation:
• Never put anything in black water tank other than toilet paper especially for motor home
systems.
• Do not put automotive antifreeze, household toilet cleaners or drain cleaners, or any solid
material into the waste water system.
• Always use chemicals in the black water system that are made especially for this purpose.
• When cleaning components of waste water system use cleaners made for motor home
systems.
• Always keep the drain cap in place, and termination valves closed.
• After every third time the holding tanks are emptied, fill and flush both tanks with clean fresh
water a couple of times to keep them clear and clean.
Note: If connecting to a campsite sewer inlet, DO NOT open termination valves until
tanks are 3/4 full. DO NOT keep black water valve open while parked. Wastes are
NOT flushed directly into sewer system. Only liquid waste is drained, therefore,
water must accumulate, and chemicals in tank need time to break down
solids before they can be released. If draining gray water tank directly into sewer
inlet while parked, make sure to close termination valve for a period of time before
leaving, allowing some water to accumulate in tank to use for flushing drain line and
flexible hose.
Note: Always remember to clean up the dump site before leaving. NEVER empty your
holding tanks directly on the ground, roadway or into a river or stream. DO NOT
POLLUTE.
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