G Thread 1/2" Female to NPT Thread 1/2" Male Pipe Fitting Adapter G1/2" Pipe fittings female Thread Water Pipe to 1/2" NPT Adapter Metric BSP 1/2" (G) female to NPT 1/2" male pipe fitting converter (Brass) Lead - Free Adapter. Material : Brass "G thread female" means that the female part of the adapter is G thread. Size : 1/2" Female G ,1/2 " Male NPT