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2. National pipe thread - Wikipedia

   en.wikipedia.org/wiki/National_pipe_thread

   The pipe has a male NPT thread, while the elbow is female. ... This means that NPT fittings should be burr-free and lubricated using a lubricant ... 3 8 0.12500000 3. ...

3. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Piping or tubing is usually inserted into fittings to make connections. Connectors are assigned a gender, abbreviated M or F. An example of this is a "3 ⁄ 4-inch female adapter NPT", which would have a corresponding male connection of the same size and thread standard (in this case also NPT).