Telephone jack?
Posted: Fri Mar 30, 2007 9:35 am
It's a standard RJ-12 telephone jack. On my 1991, the outside connection is curbside, near the water heater, along with the cable TV connection.
Website for owners of Airstream's B190 and Okanagan campers: "It's not a slow car; it's a fast house!"
https://www.b190.com/