Bernard™ Quick Disconnect 3/4" Nozzle is made of copper and ideal for use with water-cooled MIG guns. Nozzle is compatible with Bernard™ Q-Guns™ and S-Guns™. The most important consideration while ordering is that the gas diffuser/head you select will determine the optional parts available such as tips, insulator and nozzle. Nozzle includes insulator - 4061, insulator clamp - 402, water lines - MS4100, water line fittings- 4234 and water line clamps - 1520005. Nozzle is ideal for use in various welding applications.