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Adaptor Cu FI 15x3/8" A copper 15x3/8 inch FI adaptor is a fitting that connects two pieces of copper pipe together. It is usually used in plumbing and heating systems, to join pipes together in a secure, stable fashion. The adaptor has a female thread on one end, and a male thread on the other. The size of the adaptor is 15 mm in diameter and 3/8 inch in length.