This CPI series union meets the standards for ASME SB75, ASTM B75, has a length of 1⅝ inch, a maximum operating pressure of 3,500 psi and is designed for the following applications: gases, liquids. It has an operating temperature of 40 Degrees F to 400 Degrees F and is resistant to corrosion, vibration and is made of brass. In addition, it is a straight connector, with an imperial system of measurement. Plus, it has a ½ inch hex size.