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<p>[QUOTE=&quot;springfld.arsenal, post: 302090, member: 54&quot;]My WAG is related to King’s post, sorta.&nbsp; If you have larger, non portable CO2 tanks, maybe these fittings were to guide a thin gauge hose.&nbsp; And I don’t know if there’s such a thing as a gauge hose!&nbsp; If you wanted to know the tank pressure to do your maintenance checklist and the tank wasn’t readily accessible the little thin hose could connect tank to gauge some distance away.&nbsp; A hose that thin couldn’t pass enuf gas (!) to be useful in firefighting, I wouldn’t think, but it would transmit static gas pressure adequate to work a pressure gauge.[/QUOTE]</p><p><br /></p>

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