This nut meets the standards for NSF 61 Annex G, has a length of ⅜ inch, a maximum operating pressure of 200 psi and is designed for the following applications: potable water. It has an operating temperature of 65 Degrees F to 250 Degrees F, and is made of brass. In addition, it is a nut, with an imperial system of measurement, and 11/16"-20 thread. Plus, it has a compression connection type and ¾ inch hex size.