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From: Ralph Mowery <rmowery42@charter.net>
Newsgroups: sci.electronics.repair
Subject: Re: Re (2): Schrader connectors for medical air and nitrogen.
Date: Fri, 31 May 2024 09:55:32 -0400
Organization: A noiseless patient Spider
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In article <v37q8h$18b4k$1@dont-email.me>, peter@easthope.ca says...
> 
> In article <v2qo44$2f14t$1@news.eternal-september.org>, ehsjr 
> <ehsjr@verizon.net> wrote: 
> > The only difference I can see is the SH-12 is for nitrogen, the 
> > SH-16 is for air.
> 
> Understood.  One is marked "Air" and the other "N2".
> 
> A few microns or thousands of an inch can block interchangeability.
> Obvious when fitting parts; not in photographs. Fitting a UNC nut to a 
> UNF screw is a more extreme example.
> 
> 
> 

Same way that some connectors are left or right hand threads.