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[AUDITORY] Zwislocki couplers



Dear List Members,

I have a question about Zwislocki couplers. Does anyone know the 
difference between the Knowles DB-100 and DB-4005? They look identical 
(apart from the 4005 I have being gold/brass colored and the 100 being 
stainless), but with vision being an inferior sense, I thought I would ask.

Thanks,

Chris