Our Rubber Bellows Expansion Joints Rubber Lined Large Diameter DN900 FF are manufactured in our own factory using high-quality materials. These expansion joints are designed to absorb thermal movements, vibration and noise in pipelines. They are lined with rubber to resist chemicals and corrosion. The large diameter DN900 FF size is suitable for a range of applications. Our products are rigorously tested to ensure their durability and reliability. As a factory, we offer competitive pricing and timely fulfillment of orders. Trust us for all your expansion joint needs.