This Compress-Align series tube nut has a length of ⅜ inch, a maximum operating pressure of 2,800 psi and is designed for the following applications: air, inert gases, non-combustible gases. It has an operating temperature of 65 Degrees F to 250 Degrees F, and is made of brass. In addition, it is a nut/sleeve, with an imperial system of measurement, and 5/16"-24 thread. Plus, it has a compression connection type and ⅜ inch hex size.