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MIP stands for Male Iron Pipe, also known as MPT Male Pipe Thread. It is a term for pipe fittings. FIP stands for Female Iron Pipe, also known as FPT Female Pipe Thread, and is a term for pipe fittings that MIP fittings go into. The difference between FIP, MIP and Compression fittings is in the tapering of the thread. Teflon tape or thread sealant compound is used on the pipe threads to help create a proper seal. Some examples of pipe materials making use of MIP fittings include: galvanized steel, black iron, and sometimes thick copper. Galvanized steel most commonly for water, black iron most commonly for natural gas.