Use the Bridgeport 1110-DC 3-1/2" Die Cast Zinc 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. Made of zinc, the body provides corrosion resistance for long-term use in most environments. This conduit nipple meets Nema Standard: FB-1 and UL Standard: UL-514B.