what's this inlet for on my Miller S-60 feeder?

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the wire inlet on my feeder resembles an airhose disconnect . it seems a mystery to me  -i can't find any info about it .  right now, i'm just running the wire through it . the miller parts manual shows a simple brass tube where this device is .is this for the wire straightener attachment?it looks like this pic: Attached ImagesMiller S60 feederCobramatic push/pull feederMiller CP-252tsLincoln Tig250/Tig250Lincoln weldpak 100 -italianC-H 90A- italianHarris & Victor O\Afull manual & CNC machine shop