Get galvanized pipe from Grainger. Choose from dielectric nipples, pipe nipples, right and left hand nipples and more. All nipples have a weld bead inside and are NPT threaded at both ends. Black nipples are interchangeable with black cast iron or steel. Galvanized nipples resist rust and corrosion. Use galvanized pipe for low-pressure plumbing applications including air, water, oil, natural gas, and steam.