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<p>[QUOTE=&quot;lptools, post: 1197536, member: 12131&quot;]I only mentioned acetylene to explain the differences in the thread types. Also, water valve stems often have a left-hand thread on the stems. I also doubt this is anything pneumatic, there are no seals for air flow/pressure. One suggestion at work was a gage of sorts, that is why the ranges are stamped. Another suggestion was automotive.&nbsp; Thanks for all the replies so far!!!![/QUOTE]</p><p><br /></p>

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