Uniweld S27 Soft Flame Air/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 plumbersStraight configuration Size S22 tip end 2700°F Target heat 1/8" to 3/8" Copper tube soldering capacity Up to 1/8" copper tube brazing capacityK37, K38