Uniweld K38 Air / Acetylene Soft Flame Kit This flame tool has been around for over 50 years Its time tested proven performance withstands the most abusive of field conditions The soft flame produces a precise 2700°F target heat and is excellent for soldering copper tubing Learn more about Soft Flame Technology Copper tubing capacity soft solder up to ½" Brazing capacity up to 3/8" MC Size Acetylene Regulator Handle with rear control valve (TH3) Soft Flame Tip (S23) 12-½ FT. Acetylene Hose (packed in box) (H12) Instructions