Mpt?

[kari]

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