This brass pipe nipple is made from solid, lead free brass with male tapered pipe threads on both ends. The naturally durable brass is resistant to corrosion and is commonly used in low to medium pressure plumbing applications. For use with oil, water and air lines made from copper, brass or iron pipe. For use with oil, water and air lines made from copper, brass or iron pipe Not for underground use NSF 371 and 61 certified Lead-free brass has a weighted average of no more than 0.25% lead on all wetted surfaces of pipes and plumbing fittings and fixtures NPT standard -65°F - 250°F working temperature Do not over tighten-install according