This compression series union reducer meets the standards for UL, has a length of 1⅜ inch, a maximum operating pressure of 1,400 psi and is designed for the following applications: air, inert gases, non-combustible gases, potable water. It has an operating temperature of 65 Degrees F to 200 Degrees F, and is made of brass. In addition, it is a straight reducing connector, with an imperial system of measurement. Plus, it has a 9/16 inch hex size.