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Metal caps for bung openings in plastic and metal containers for the purpose of preventing contaminants from entering the plastic and metal containers; Sealing caps of metal; Sealing caps of metal for bung openings in plastic and metal containers for the purpose of preventing contaminants from entering the plastic and metal containers

Non-metallic sealing caps; Plastic cap that covers bung openings in plastic and metal containers for the purpose of preventing contaminants from entering the plastic and metal containers