FMSI > Air Conditioning System > A/C Tube Repair > Aluminum Joiners, Reducers Unions & Block Caps > Item # 5139 FMSIFMSI Air Conditioning SystemAir Conditioning System A/C Tube RepairA/C Tube Repair Aluminum Joiners, Reducers Unions & Block CapsAluminum Joiners, Reducers Unions & Block Caps Item # 5139 Item # 5139, Aluminum Unions Standard Tube 5139Aluminum Unions Standard Tube Request Information Email This Page Download PDF Download PDF Printable Page /Asset/a1502.jpg /Asset/a1502.jpg Close Window Joins Aluminum to Aluminum Tube Aluminum to Steel Tube Aluminum to Copper Tube Unit of Measure Imperial Metric Both Specifications Size N/A 19 mm3/4 in