Extension of brass lubrication fittings with internal and external wire

Extension coupling with internal and external threads, brass 1pt/2pt/3pt. 1pt extension coupling with internal and external threads 50/75/100/125/150mm, 2pt extension coupling with internal and external threads 50/75/100/110/125/150mm, 3pt extension coupling with internal and external threads 50/75/100/125/150mm.