How do I cut a PG thread?

Where does one buy a tap, or better yet an 80 degree insert for this internal thread. The job I'm quoting has a PG13.5 thread.
http://mdmetric.com/tech/thddat6.htm
emailed above for a quote on a tap. their web site is impossible to use.
Thank You, Randy
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http://www.heyco.com/products/sec_02/2-27a.html# .......... They have it, need to search more, or call. http://www.mcmaster.com/#conduit-taps/=a1qpaw ........ 2485A14
http://www.e-taps.com/Ofertapage%20060.htm
Type Conduit tap into Google.
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