1/2" Compression Nut for 1/2" Outside Diameter Tubing This is a 1/2" compression nut that is designed to be used with 1/2" outside diameter tube and a 1/2" compression fitting. This nut is made out of solid brass and comes with the ferrule sleeve. The sleeve comes pre-pressed into the nut so you wont have to deal with any misalignment issues when installing your new tubing. This fitting is also sometimes referred to as a captive sleeve compression nut. Specifications: Material: Brass Thread Size: 11/16-20 Includes Nut and Ferrule Sleeve Vibration Resistance: Fair Temperature Range: -65°F to 250°F Use With: Brass, Bronze, Copper, Steel, Aluminum, and Iron Pipe