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NPT, National Pipe Taper (American) and BSPT (British standard Pipe Taper) are tapered pipe thread standards. Male and female tapered pipe threads wedge themselves together but need a sealant for a completely leak-free connection.
The 4 best known pipe thread types at a glance ( NPT, NPTF, BSP, BSPT ) - Threading tools guide
ISM
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