The SSBBW #20 Hybrid cup includes a spare diffuser and extra glass. This is the largest cup currently manufactured by Furick and is recommended for materials 2" and larger to ensure enough surface for smooth welding. Specifications recommend 5/8" stick out for 3/32" tungsten with a setting of 150 map amps. This cup will use 35-45 CFH argon flow. This is not your beginner's cup and some practice welding may be useful for your application.