Plumbing Systems and Holding Tanks
slopes evenly.
2. Drain the black water holding tank first.
Grasp the handle of the black water knife
valve (the large one) firmly and slide the
valve open with a quick, steady pull.
3. Allow enough time for the tank to drain
completely. Rinse and flush the tank
through the toilet. When the tank is empty,
push the handle in to close the valve. Run
enough water (up to five gallons or so) into
the tank to cover the bottom. This will aid
the break up of solid wastes, and reduce
“pyramiding” of waste material.
4. To drain the gray water tank, repeat the
steps above using the small knife valve.
This tank is drained last to aid in flushing
the outlets and hose. The gray water knife
valve may be left open in a semi-perma-
nent hookup.
5. See the tank flush system instructions in
the next section if your recreational vehicle
is so equipped.
6. Remove the sewer hose and cap the outlet.
7. Rinse out the sewer hose with fresh water
and remove the sewer hose from the dump
station.
8. Replace sewer or dump station covers.
Black Tank Flush System
(If Equipped)
A black water holding tank system that is
equipped with a flush system has rinsing spray
heads that will aid in the removal of sewage
residue from the interior of the holding tank. To
operate the tank flushing system, follow the pro-
cedures for
Draining The Holding Tanks
in this
chapter. After dumping the gray water tank pro-
ceed as follows:
1. With the dump valves open, attach a garden
hose to the black tank flush inlet connection.
2. Turn on water supply to garden hose and
allow the water to run for approximately
three minutes to flush tank.
3. Turn off water supply to garden hose.
4. Rinse out the sewer hose with fresh water
and remove the sewer hose from the dump
station.
5. Remove hose from black tank flush inlet
connection and store hose.
6. After rinse water has thoroughly drained
from the black tank, close the knife valve
and replace the termination cap. If you are
parked at a site with a semipermanent sewer
hookup, keep the black water knife valve
closed to allow the waste level to build up.
The outlet will probably clog if you leave the
knife valve open continually. Run enough
water into the tank to cover the bottom. This
will aid the break up of solid wastes.
7. Replace sewer or dump station covers.
Please...Practice good housekeeping when
draining wastes at a campsite or disposal sta-
tion. Leave the site in good order. Above all, do
not pollute.
CAUTION
Do not use the same hose you use for filling the
potable water tank, or for connection to the city water
inlet. This is especially true if you the connect the quick
connect hose to the typical rinsing hoses at most
dumping stations. Use of a different hose will insure
that you will not contaminate your fresh water supply.
!
CAUTION
The sewer drain valve must be open when using the
black tank flush inlet.
!
CAUTION
The sewer drain valve must be open when using the
black tank flush inlet.
!
07-6
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