Airstream Land Yacht 2006 Owner's Manual page 53

LP TANK
The regulator at the L.P. tank is
under a black plastic cover. The
protective cover certainly helps
to keep the vent on the regulator
from getting clogged by wasps
or ice, but should still be
checked regularly to make sure
the vent remains clear.
WARNING
WARNING
obstructions.
PLUMBING
: Do not attempt to seal regulator cover.
: Check vent each time tank is filled to make sure it is clear of
G-3