"LD" wrote in message
know how loud this 85db compressor sounds compared to the old one that
I'm
giving to a friend.

What did you use on the old one?

Nothing. Didn't occur to me when I bought it some ten years ago. And yes,
there was a small, discernable hiss right at the point of air exiting
whatever male adapter I had inserted. Also, all the adapters appeared to be
some type of silver coloured alloy. This time they're all copper as
recommended.