Nominal Pipe Size (NPS) Conversion. DN. (mm). NPS. (inches). 10, ⅜. 15, ½. 20, ¾. 25, 1. 32, 1 ¼. 40, 1 ½. 50, 2. –, 2 ½. 65, –. 80, 3. –, 3 ½. 100, 4.
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