Use the Bridgeport 1103-I 3/4" Malleable Iron Insulated Conduit Nipple with a locknut to extend a conduit system between enclosures. The nipple features NPSM threads that create a pressure-tight, vibration-resistant seal that is created when the male and female threads are properly connected. Electrical conduit nipples fit on each end of a male thread while maintaining the form of the wiring within.The nipple features an insulated throat rated up to 105°C. Malleable iron ensures the coupling has excellent tensile strength. This conduit nipple meets Nema Standard: FB-1 and UL Standard: UL-514B.