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Wilden Pump Repair Part Double Diaphragm PTFE Diaphragm for Aodd Pumps. PTFE Material: Made of PTFE with excellent chemical stability and corrosion resistance. Corrosion Resistance: Resistant to strong acids, alkalis, and various organic solvents. Low Friction: Features high lubrication with the lowest coefficient of friction among solid materials. Non-Adhesive Surface: Does not adhere to any substances due to smallest surface tension. Versatile Application: Suitable for petrochemical, water treatment, pharmaceutical, and food industries. Customization Options: Offers customization from samples, designs, and flexible minor customization. Fast Delivery: Shipped within 7-15 days after payment confirmation.