Uniweld S22 Soft Flame Acetylene Tip The soft flame produces a precise 2700°F target heat and is excellent for soldering copper tubing A time tested flame tool with over 50 years of proven performance Withstands the most abusive of field conditions A favorite of plumbers Size 2 2700°F Target heat 1/8" to 3/8" Copper Tube Soldering Capacity Up to 1/8" Copper Tube Brazing Capacity