British Standard Pipe Tapered (BSPT)
The BSPT (tapered) male will mate with a BSPT
(tapered) female, or a BSPOR (parallel) female.
The BSPT male has tapered threads. When mating
with either the BSPT (tapered) female or the BSPOR
(parallel) female port, the seal is made on the threads.
The BSPT connector is similar to, but not
interchangeable with, the NPTF connector. The
thread pitch is different in most cases, and the
thread angle is 55° instead of the 60° angle found
on NPTF threads.