Sure! Just be sure to put some anti-freeze back in the tanks after you dump. You could even use the jug/bottle with the sinks, ust do the same. I would get 1-2 gallons of the stuff and re-winterize as soon as you have dumped the tanks.
__________________
Brett G
WBCCI #5501 AIR # 49
-------------------------
1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.