This nipple meets the standards for ASTM A106 Grade B, has a length of four inches, a maximum operating pressure of 2000 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 43/64 inch outside diameter, ⅜ inch inside diameter and is Schedule 80, with 0.125 inch wall thickness.