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Counterlung details.  Bar on inner collar of hose fitting is to prevent  possible stoppage of gas flow by the opposite side of the counterlung covering the opening while gas still remained in the upper part of the bag.  Note welded seal near edge of bag.  All hose fittings on the Electrolung had a groove like this one.  The groove is beneath where the hose clamp goes and hose material is squeezed into the groove by the clamp making for a much more secure attachment than a smooth surface.