I need some rather specific zippers. Are there any good stores or manufacturer’s showrooms with a LOT of choices? These will be for heavy-weather raingear, so they need to be rubberized, rotproof, and stainless steel teeth.

Try the world trade center showrooms

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None of the Taiwan or Chinese manufacturers have it ( even if they say they do ).

You best choice is the Raindefyer from Lenzip.

try here