Airstream 2019 International, Owner'S Manual

Page: 79 / 104

Maintenance
2019 International
8-13
Black and Gray Water Tank Draining
To empty one or both tanks, attach the sewer hose
by pressing the bayonet fitting onto the dump valve
outlet and rotating clockwise until it feels solid and
secure. Attach the outlet end of the hose to the sewage
outlet, making sure the hose is placed so it will drain
completely. Pull the main dump valve handle as far as
it will go and wait until the tank is drained. Close the
dump valve and partially refill the tank with clean water,
and repeat the process until clean. The main holding
tank must be flushed out until all paper and waste
material is removed. Now pull the auxiliary tank valve
handle to drain the gray water tank. When dumping,
the main holding tank should be dumped first, then the
auxiliary holding tank. This will help to rinse the sewer
line with auxiliary holding tank water. Replace the
bayonet ring cap prior to traveling.
Black Water Tank Dumping
When you are in a park and connected to a sewer
outlet, keep the main holding tank dump valve closed
and empty the tank every few days, or whenever it
becomes almost full. Only by sending a large volume
of liquid, all at once, through the main holding tank will
toilet paper and other solids completely wash away.
This practice will avoid the accumulation of solids in the
main holding tank, which could lead to an unpleasant
cleaning job. Should solids accumulate, close the
dump valve, fill the tank about half full with water, then
tow the trailer for a few miles. The turbulence and
surging of the water will usually dissolve the solids into
suspension so the tank can be drained.
Draining the tanks as described will protect them from
freezing during storage. When traveling in sub-freezing
temperatures, use a winterizing solution designed for
RV use. Follow the directions on the container.
1� Black Water (Main) Dump Valve
2� Light
3� Light Switch
4�
Auxiliary Tank Dump Valve
5� Drain Cap
1
5
4
3
2
1� Wastewater (Gray) Tank Valve
2� Light
3� Light Switch
4�
Sewage (Black) Tank Valve
5� Drain Cap (Drain Hose Hookup)