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Adaptor Cu FI 28x5/4" A copper FI 28x5/4" adaptor is used to connect two pipes or two fittings of different sizes together. It is often used in plumbing and drainage applications. The 28x5/4" refers to the size of the adaptor, which is 28 millimeters on the outside diameter and 5/4" (1.25 inches) on the inside diameter. The copper material is resistant to corrosion and heat, making it ideal for water and gas applications.