WATER SYSTEM
THOR MOTOR COACH | MADE TO FIT
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Waste Water System
e waste water system of your motorhome consists of
bathroom xtures, drainage plumbing, waste water holding
tanks, drainage vents, and sewage valves. It is important
to familiarize yourself with the motorhome’s waste water
system, for it does require monitoring, routine and long-
term maintenance.
Drain Pipes
Remove the waterless trap before using mechanical
drain-rooting devices. Otherwise, the waterless trap
can be damaged.
NOTICENOTICE
Drain pipes have P-traps and/or waterless traps (HEPVOs)
installed to help prevent drain odors from escaping into the
motorhome. During travel, water within P-traps may dis-
place, which could allow waste water system odors into the
motorhome. Drain-related odors come from decomposing
materials in the holding tank. If odors are detected, place a
few cups of water down each drain and use a RV approved
deodorizing agent, which will reduce drain odors and help
keep the drain lines and tanks clean and free owing. Drain
chemicals are available at RV supply stores.
Vents
Vent pipes and vents release air from the gray and black
water holding tanks. e exterior vent cap is attached to
the roof, and must be kept clear of debris and obstructions
to perform as intended. On some brands and models, the
vent pipe may be part of the drainage system referred to as
a “wet vent” (water ows downward as air ows upward in
the same pipe).
Waste Water Holding Tanks
Your motorhome is tted with separate waste holding
tanks designed to separately collect waste water and waste
solids. Typically, waste water from kitchen sinks, bathroom
sinks and bathroom shower(s) is collected and stored in
the Gray Water tank, while solids from bathroom toilet(s)
is collected and stored in the Black Water tank. Some
oor plans may have two black tanks, while others may
drain bathroom sinks and/or the shower into the black
tank. Waste water collection tanks have valves that allow
for emptying the tanks into an external sewage collection
facility, commonly known as a ‘dump station.’
When traveling, it is good practice to minimize the waste
water (gray and black) carried in your motorhome. is will
reduce the total weight of your motorhome, allowing for
carrying capacity for other items, if needed. Refer to Section
6, Occupant and Cargo Carrying and Capacity (OCCC).
NOTE: Monitoring the level of waste water within the
holding tanks is provided for on the Monitor Panel or,
if equipped, on the main Multiplex touch-screen panel.
Typically, tank level is indicated in 1/3 increments.
Termination Valves and Termination
Compartment
e termination compartment generally contains the
waste water components listed in this section. Please note
that due to the variety of TMC motorhome models and
oor plans, the items described in this section are general
in nature and may or may not pertain to your termination
valve conguration.
• Termination valve handles for both gray and black
water holding tanks. To open, grab handle, and pull
outward. Make sure that the sewer drain hose is con-
nected before opening these valves.
• Termination cap. Remove cap to install the exible sew-
er drain hose (not supplied by TMC). Be sure that the
termination valves are closed before removing this cap.
• Sewer holding tank ush attachment. Attach the city
pressure hose and allow the water to ow for three
minutes. Refer to the Black Tank Flush description in
this section.
• Hatch cover. Open this and pass your city pressure
hose through. Close with hose passing through small
opening in the cover.
Typical termination valve configuration
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