PlUMbiNq
SYSTEMS
The holding tanks terminate in a valve arrangement that per-
mits draining each tank separately or together.
The valves are called knife valves. A blade closes the open-
ing in the sewer drain pipes. The blade is connected to a
T-
handle assembly mounted in the utility compartment. Pull
the T-handle to release the contents
of
the tank(s).
During self-containment use, the sewer line is securely
capped to prevent leakage
of
waste material onto the ground
or pavement.
Do not pull the holding tank knife valve open
when the protective cap is installed on the pipe.
Always
drain the tank into an acceptable sewer inlet or dump station.
Whenever possible, drain the holding tanks before traveling.
Waste water and sewage in the holding tanks reduce the car-
rying capacity
of
the motor home. See the Motor Home
Loading
chapter.
Drain the holding tanks only when they are at least
'I.-full.
If
necessary, fill the tanks with water
to
'I.-full. This provides
sufficient water to allow complete flushing
of
waste material
into the sewer line.
During extended or semi-permanent hookups to sewage sys-
tems, waste materials will build up in the tank and cause
serious plugging
if
the tank valves are continuously open. In
these cases, keep the valves closed until the tanks are
'I.-full,
and then drain into the sewage system.
The holding tank drain valve outlet is
to
be used with a
removable termination fitting that locks onto the outlet with a
clockwise twist. Clamp the sewer drain hose
to
this fitting. A
protective cap should remain in place when you are not
draining the tanks.
DRAINING
THE
HOLDING
TANKS
WARNING
Holding tanks are en-
closed sewer systems
and as such must
be
drained into
an
approved
dump station.
80th black
and
grey water holding
tanks must
be
drained
and
thoroughly rinsed
regularly
to
prevent accu-
mulation of harmful or
toxic
materials.
PACE AI/I/ow
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