Brass pipe nipples are made from solid, lead free brass stock and have male tapered pipe threads on both ends. Brass is very durable and resists corrosion. The fitting diameter is measured using the outer diameter measurement. Easy to install, this pipe fitting is commonly used for low to medium pressure plumbing applications. 1-piece per package LFA-877 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 to manufacturer's directions