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This class 3000 stainless steel 304/304L union is a pipe fitting with female National Pipe Taper (NPT) threads for extending and connecting male pipes. The union has NPT threads for compatibility with a wide range of thread and can usually be taken apart more easily than a coupling fitting. This class 3000 fitting is made of forged stainless steel 304/304L for durability and corrosion resistance. Class is a standard relating to tolerance, construction, dimension, and wall thickness, but it is not a direct measurement of maximum working pressure. This fitting meets standards ASTM A182, ASME SA182, and ANSI B16.11 for quality assurance. Pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. When purchasing pipe fittings, consider the application, as this will affect material type, shape, size and required durability. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).