The product is a box of 25 new MATCO NORTICA 1/8" X 5" Black Pipe Nipples made of steel with a Schedule 40 rating and a maximum steam pressure of 150 psi at 360 degrees F. These nipples have an inside diameter of 31/64 inches, an outside diameter of 43/64 inches, and are suitable for non-potable water, oil, steam, and gas applications. They have a continuous weld construction and a black anodized finish, with a maximum operating pressure of 300 psi at 150 degrees F. These American-made pipe nipples are designed for use in air systems.