This nipple meets the standards for ASTM A106 Grade B, has a length of 12 inches, a maximum operating pressure of 1000 psi @ 150 Degrees F and is designed for the following applications: air, gas, non-potable water, oil, steam. It is made of B-grade steel with a black anodized finish/coating. In addition, it has 4½ inch outside diameter, four-inch inside diameter and is Schedule 80, with 0.328 inch wall thickness.