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Rubber back up ring is a kind of back up ring which is made of rubber. Rubber has a variety of properties that make it quite useful, including being abrasion-resistant, chemical-resistant, waterproof, somewhat stretchable, and buoyant. A back up ring is a small piece of material welded between two pipes. They are usually round to fit most pipes, but there are also square-shaped rings. A typical back up ring is made of rubber or metal such as aluminum, chrome, or carbon steel. Pipe backing rings allow proper alignment between two joined pipes, hold the pipe joints together, and prevent leaks.