FMSI > Air Conditioning System > A/C Tube Repair > Aluminum Joiners, Reducers Unions & Block Caps > Item # 5261 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 # 5261 Item # 5261, Aluminum Unions Metric Tube 5261Aluminum Unions Metric Tube Request Information Email This Page Download PDF Download PDF Printable Page 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 14 mm