Uniweld X3BUCT Twister® Air Acetylene Kit, with "B" Tank 1F85U 42PR Easily select between materials with 48111837 Easily select between materials with mode button to test surface of drywall The easy to see orange float ball visually confirms the nitrogen is flowing and allows the technician to first “PURGE” the copper lines at 20+ SCFH and then reduce the flow to “BRAZE” at 3 5 SCFH during the brazing process thus conserves its consumption and reduces operating cost Uniweld’s Twister® Kit is a professional grade kit for use in soldering and brazing Regulator: RB Acetylene Regulator Handle: TH6 Quick Connect Quick Connect Rear Control Valve Tips: A 3