All Airstream models (with two tanks) offer a two stage automatic regulator which ensures continuous gas flow by switching the propane gas supply from an exhausted tank to a full reserve (secondary) cylinder. The regulator can be found on top of the propane tanks under the aluminum L.P. cover.
Airstream Travel Trailer LP Tanks, Cover, and Regulator
Airstream Bambi LP Tanks, Cover, and Regulator
Airstream Basecamp LP Tanks, Cover, and Regulator
Airstream Classic LP Tanks, Cover, and Regulator
Note:
All Airstream models offer a quick LP (liquid propane) connect port that can be utilized with the Airstream Weber® Q®1200 Gas Grill.
https://airstreamsupplycompany.com/products/weber-q1200-gas-grill-airstream-edition