Used in a number of plumbing applications, brass nipples are both inexpensive while being versatile and reliable. Brass nipples are corrosion resistant and are often used in systems that work with chemicals, water, oil, or gas. The tight seals the brass nipples provide make them very popular among industrial and landscape professionals. All our brass nipples are NPT iron pipe sized thread and fit any size 1/4" to 4" in diameter.