Classic - Airstream

until clean. Replace the cap prior to traveling.
The main and auxiliary tanks are heated by ducting from the furnace. Be sure to
follow winterizing instructions for the tanks immediately in freezing temperatures
if heat is not being supplied to the trailer.
Black Tank Flush
Inside the underbelly utility compartment is a water hose connector for the
“black tank flush”. To use, hook up a hose and turn it on full force. Within
the tank a head with multiple holes will spray the interior surface of the tank.
A vacuum breaker and one-way valve is located inside the trailer above the
exterior connection to prevent the black water from escaping to the hose
connection. In most models this will place them under the lavatory.
Plumbing
THROUGH THE MAIN HOLDING TANK AT A TIME 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. Keep the auxiliary tank
valve open when connected to a sewer outlet.
Draining the tanks as described will protect them from freezing during
storage or when traveling in winter conditions. When traveling in sub-freezing
temperatures and using the drain system use a winterizing solution designed
for RV use. Follow the directions on the container.
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The gate valve should be closed for the first couple of minutes, and then opened
to let the water out in a rush. Close the gate valve and repeat as needed.
When Parked and Connected to Sewer Outlet
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 products should be marked approved for ABS drainage systems.
Drain Systems Cleaning
The only cleaning agents that can be used without causing harm to the system
are household ammonia and tri-sodium phosphate in small quantities. Do not
use any product that contains any portion of petroleum distillates. This attacks
the rubber seats of your toilet and dump valve. Also, do not use any dish
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