It means “Nominal Pipe Size,” and it is the North American standard for measuring pipe sizes used for various pressures and temperatures.
Stainless pipes & tubes, Stainless steel pipes
Specs Includes Resources Lead Time Nominal Pipe Size (Diameter Nominal): NPS 1-1/2 (DN 35) Outside Diameter of Pipe: 1.900 (48.3 mm) Inside Diameter
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