RapidAir Maxline industrial compressed air piping systems are fast and easy to install. They feature leakproof, corrosion resistant fittings that are built to last. These air hose connectors work great for your workshop with applications from automotive to woodworking. Attach the supplied 3/8" npt fitting to your air outlet block using 1/2" Air Hose. Nickel plated brass. Double o-ring design. Split ring allows disassembly. No expensive tools required. Operating pressure: 175psi at 70° F / 140psi at 140° F. Meets OSHA guidelines. Temperature range: -40° F to 140° F. Compatible with common compressor oils. Included in our Maxline Air Hose Outlet Kits. Sold as a set of 5.