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Adaptor Cu FI 15x3/4" A 15x3/4" copper FI adaptor is a type of fitting used to connect two pieces of copper pipe. It is designed to provide a leak-free seal between the two pipes. The adaptor is usually a short length of copper pipe with two female threads, one on each end. It can be used to join two pipes of different sizes, or to join two pipes of the same size.