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American National Standard Pipe Threads NPT: National Pipe Taper Thread A sealant compound or Teflon tape must be used for a leak-free seal. FPT: female (internal) National Pipe Taper threads MPT: male (external) National Pipe Taper threads NPTF: Dryseal American National Standard Taper Pipe Thread No sealant is needed for a seal. NPS: American Standard Straight Pipe Thread Used for mechanical joining -- holding a fitting in place. An O-ring or a metal seal is required. NPSF: Dryseal American National Standard Straight Pipe Thread British Standard Pipe Thread BSPT: British Standard Pipe Taper threads BSPP: British Standard Pipe Parallel (straight) threads