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Adaptor Cu FI 22x1/2" A Cu FI 22x1/2" adaptor is a copper fitting used to connect pipes together. It is typically used to connect two pipes of different sizes or materials, and is also used to change the direction of the flow of the pipe. The 22x1/2" refers to the outer diameter of the fitting, which is 22 millimeters (roughly 7/8 of an inch).