Found the faucet Fix
I would have posted this sooner but was on the receiving end of lousy park WiFi ---
The subject / 2011 28ft Airstream International Serenity - and the galley faucet was AFU - bought an Ikea Tarnan kitchen faucet that fit perfectly, but the connectors were not going to work together (consumer leads to Airstream water leads).
Went to Home Depot and voila'! Watts compression adaptors LFA-124: 3/8" to half inch : male to male coupler. They only set me back about $11.00
Screwed things on with teflon tape, turned the water back on - done! and now a fully functioning faucet for the first time in a good year and a half. The faucet Airstream used was problematic from the outset. . The Ikea faucet had a much better build. .
Too bad I can't upload the photo