ANSWERS: 1
  • NPT = American National Pipe Tapered 60degeree thread BSP ?? could be either BSPP = British standard pipe parallel BSPT = British standard pipe tapered 55 degree thread With the 1/2" and 3/4" in both of these they are difficult to tell the diference as both of these have 14 threads per inch. The other sizes the theads per inch is different. The site below show the slight differences http://www.colder.com/Portals/0/pdfs/NPT.pdf

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