1000pcs 20mm Butyl Rubber Stopper Plug for medical glass bottle Vials WTEC | eBay
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DWK Life Sciences DURAN Grey Bromobutyl Rubber Stopper, Straight Plug, | Fisher Scientific
China 20mm Grey Butyl Rubber Stopper/rubber stopper for pharmaceutical use Manufacturers and Suppliers - Wholesale 20mm Grey Butyl Rubber Stopper/rubber stopper for pharmaceutical use - JOTOP GLASS
Rubber Stoppers gray butyl rubber, size 20 mm | Sigma-Aldrich