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There are just a few examples of the huge diversity of plumbing fittings. In residential plumbing consider all of the different pipe materials available and all of the different ways they can be connected. Specific fixtures in the home have their own specific connection type, such as the water supply to a toilet. Finally, there are companies that make their own proprietary fittings and connectors. Proprietary types are not discussed and their use is discouraged.The most typical connections between like building materials are made and some examples include: Copper pipes are typically connected with copper fittings that are smooth inside and soldered. You solder a fitting to a copper pipe. Steel (Galvanized) and Iron (Black) are sealed with Teflon (PTFE) tape or pipe thread compound since both types are threaded pipes. [[PEX]] connections are typically made with compression fittings, crimped on to create a water tight seal.