Well, mine doesn't have any identifying marks anywhere except the Craftsman
stickers. Sears does still show the unit, and has the parts breakdown, but
doesn't provide parts any longer.

My compressor has chrome tubing coming out to the air manifold.

I think something is wrong inside the compressor. I can't turn the
compressor drive wheel past a certain point. Once I hit that point, I can
reverse it, and it hits the sticking point again going the other way.

I had hoped it would be an unloader or check valve. Universal ones of those
are readily obtainable. And, they may be repairable themselves.

However, I think I'm going to find something wrong inside the compressor.

I'll try Devilbiss and see if they can ID it as being one of theirs.

Thanks again for writing.