caution - Thor Motor Coach

Your vehicle’s holding tank compartments are heated by the furnace duct work. It will
heat the tanks when the furnace is operating.
As mentioned previously, your holding tanks terminate together at one location for
convenience in dumping your tanks. A twist-on cap is located at the terminal outlet to
help prevent leakage of materials.
The holding tanks are enclosed sewer systems, and
must be drained into an approved dump station. Tanks
should be thoroughly drained and rinsed to prevent any
accumulation on the interior of the tanks.
1. Twist off the termination cap counterclockwise. Some liquid may be trapped
between the valves.
2. Connect the sewer hose by turning it clockwise, making sure that the connection
end levers are locked over the termination end.
3. Deposit the other end of the sewer hose into an approved dump station inlet.
4. Open the black termination valve first and drain.
5. Open the gray (smaller) tank valve to drain and flush out the hose.
6. Rinse the tanks and hose thoroughly with fresh water before disconnecting.
7. Close the termination valves.
8. Rinse the sewer hose with the faucet provided in the termination compartment.
9. Replace the sewer hose to the storage location.
10. Replace the termination cap on the outlet, making sure that it is secured and
locked.
The most common holding tank problem is blocking the drain lines, which can be
minimized by following a few simple suggestions:
• Always use plenty of water when flushing.
• Do not put facial tissue, paper, baby wipes, or sanitary napkins into your holding
tanks.
• Do not put solid objects into the tank which could puncture or scratch your
tanks.
• Do not leave the termination valves in the open position or open them prior
to having the sewer hose connected. Do not remove the termination cap with the
termination valves in the open position.
• You may wish to add an approved deodorant chemical, approved for your sewer
system, to aid in the breakdown of solid wastes as well as making your system more
pleasant to use.
• Prior to dumping, make sure your tank is at least 1/3 full.
CAUTION
• Fill and cover the bottom of the tank with water after dumping is complete
and leave the water in the tank.
Water Systems
HEATED HOLDING
TANKS
DUMPING THE
HOLDING TANKS
HOW TO PREVENT
BLOCKAGE OF
DRAIN LINES
85