Bernard developed its Centerfire™ Consumable System with the user's cost considerations in mind. Our contact tips, nozzles, and diffusers are easy to use and high-performing, providing better arc starts, less spatter, and more consistent welds. They also last up to three times longer than competitive brands. These diffusers are sold individually and are compatible with 300, 400, & 500 amp Bernard MIG Guns. Centerfire Features: No tools required to replace tip or nozzle "Drop-In" tip with no threads for quick change after burnback, reducing downtime Large diameter tip base and tapered seat for better electrical conductivity and heat transfer Spatter shield within nozzle protects diffuser and provides smoother, less turbulent gas flow Solid, concentric relationship between tip and nozzle keeps tip centered even after hard use Threaded nozzle holds tip fixed at 1/4" or 1/8" recess, flush, or 1/8" stick out Compatible with all standard air-cooled Bernard Q-Gun and S-Gun MIG Guns Complete family of tips and nozzles available to meet most welding needs