Nickel Plated Brass FemaleThread Strain Relief Fitting NPT Thread

NPT stands for National Pipe Thread and is the US standard for tapered threads for connectors and fittings. NPT threads are usually longer than Metric or PG and taper toward the end.

NPT threads are designed to create a liquid-tight seal. The flanks of the threads compress against each other which allow them to form a seal when torque is applied.