A step nipple is a pipe fitting that connects two pipes or fittings of varying diameters in a plumbing or piping system. It is termed a step nipple because the ends have various diameters or stepped sizes, allowing for seamless reduction or expansion between two pipe sizes. The primary function of a step nipple is to create a secure, leak-proof transition connection between pipes with different threads or diameters.

Step nipples are often composed of stainless steel, galvanized iron (GI), brass, or carbon steel, depending on the use and operating circumstances. Stainless steel step nipples are favored in industries that require corrosion resistance and longevity, whilst GI or brass variants are employed in ordinary plumbing applications.

These fittings are often used in water supply systems, industrial pipelines, hydraulic systems, irrigation, and mechanical applications. The key benefits of a step nipple are the ability to readily connect multiple pipe diameters, good sealing performance, durability, and adaptability, making it a vital component in plumbing and industrial piping systems.

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