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Steel Pipe Nipple are used often in low pressure piping situations, like with water, oil, air, or gas lines. They function by connecting straight pipe to straight pipe, like couplings generally do. 1/2", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 1-1/2", 2"