Anvil 1"x3/4" Black Reducing 90-Degree Elbow. It is made of durable malleable iron with a black finish for corrosion resistance. This elbow connects two pipes of different diameters at a 90-degree angle, making it ideal for gas, water, and oil applications. It is easy to install and features national pipe threads for creating tighter seals than straight threads. Conforms to ASME B16.3 and B16.39 standards.