I believe my Airstream, a 1989 29' Excella has an internal water pressure regulator. Don't all Airstreams?Yes they do, at least as far back as 69, possibly further. By using a pressure regulator at the faucet you are also protecting your supply hose. I have a 100 lb pressure guage on a hose fitting. On a few occasions I have seen the gauge pegged when hooked to the campground faucet. Your airstream
Rick Davis 1602
54 Safari
69 Ambassador
70 Globetrotter
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