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Nupra valves

Hi all,

I just aquired a Nupra needle valve (it was in a box of tools I bought at an
auction for $5).  It's brand new but I don't know what model it is, an "M"
or "S".  There are no markings on it except for 'Nupra' and 'Swagelock'.
How can I tell what it is?  Or doesn't it matter?

Bob Ashcraft