Working on air brake lines or pneumatic systems? These brass fittings are exactly what you need. Each fitting connects a 3/8 inch outer diameter (OD) tube to a 1/4 inch male NPT thread, which is super common in truck air brake systems. They're made from C36000 brass, which is durable, corrosion-resistant, and easy to tighten without galling. Each pack includes the fitting, a compression nut, and a sleeve—everything you need for a secure, leak-free connection. They're DOT approved for air brake use, so you know they meet safety standards. Perfect for repairing or building air lines on semis, trailers, or industrial equipment. Just insert the tube, slide on the sleeve and nut, and tighten onto the threaded port. No welding required. Keep a few on hand for roadside repairs or shop projects. Reliable, simple, and affordable.
