Heavy Duty #7 Nozzle is used for brazing welding and heating. It is slightly bigger and is for somebody that has chosen to use a heavier gear. This could be due to the nature of the job at hand or the environment in which they work. This nozzle is one of the more common HD nozzles and is used when the #5 doesn’t quite do the job. A good all round nozzle and the “go to” for many people.
This item is consumable and may need to be replaced especially after extensive use.