KIMBLE® MICROFLEX® Erlenmeyer Flasks with Screw Cap, Graduated, DWK Life Sciences. Catalog Number: (KT749400-0025) Limited time offers. Supplier: DWK Life Sciences (KIMBLE) Description: Graduated flask useful for sample collection, derivatization reactions, extractions, sample storage, micro mixing and more. ,KT749400-0025PK.