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High-Purity PTFE Swan Neck Adapter Connector for PFA/PTFE Flasks, Fits 24 or 29 Fluoropolymer Joints. Extremely low Silicon & Trace Metal Leaching: Guarantees absolute sample purity for sensitive trace-element analysis (ICP-MS/ICP-OES). Non-Stick & Easy Cleaning: Smooth fluoropolymer interior prevents droplet retention and acid residue build-up; easily cleaned via sub-boiling acid baths.