This nipple meets the standards for ASTM A53 Type F, Grade A, ASTM A733, has a length of six inches, a maximum operating pressure of 150 psi @ 150 Degrees F and is designed for the following applications: air, gas, non-potable water, oil, steam. It is made of Grade A-grade steel with a galvanized finish/coating. In addition, it has four-inch outside diameter, 3 9/16 inch inside diameter and is Schedule 40, with 0.226 inch wall thickness.