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Copper u-bend, is a kind of u-bend, which is made of copper material. Plumbers can also make their own U-bends if they have the equipment necessary for working pipes. The return bend fitting is usually threaded so that it can connect with other pipes. When two pipes run parallel to each other and a connection needs to be made between them to allow fluid moving down one pipe to be returned up the other, a return bend is the fitting most commonly used. There are a range of settings in which such fittings can be useful. For example, in a solar hot water heater, a grid of parallel pipes linked to each other with U-bends can be used to maximize exposure to the sun so that water heats as it moves through the array of pipes.