Airstream - Other
2016 Interstate Grand Tour Ext
Bosque Farms
, New Mexico
Join Date: Jan 2004
Posts: 6,991
Sometimes hard to tell, huh?
Most times, a black valve will have a large pipe leading to it in order to carry, ah, er, clumps. A gray valve will have a smaller pipe leading to it. Alas, Airstreams are often designed so that you can't see the pipes.
Of course, you could dump a little into a bucket and examine the contents. And then slap a label on the valves.
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