Buy Proflex PVC Shielded Coupling to Copper 3 In. X 3 In.
Everbilt 600 3/4 in. x 3/4 in. Wrot Copper Cup x Cup Coupling with Stop Fitting Pro Pack (30-Pack) MPP600HD34 - The Home Depot
3007-33 - Fernco 3007-33 - 3" x 3" ProFlex Coupling (PVC, Steel, Extra-Heavy Cast Iron to Copper)
1/4" - 1/2" Insulated Copper Coil Line - HVAC Premium
Nibco® Copper Coupling, 3/4 X 3/4", Package Of 10 | HD Supply
Streamline 3/4-in Copper Rolled-Stop Coupling in the Copper Pipe & Fittings department at Lowes.com
PATIKIL 3/8 Inch ID Straight Copper Coupling, 6 Pack Sweat End Welding Joint Pipe Fitting with Rolled Tube Stop for Water Air Conditioner Plumbing - Amazon.com
MECCANIXITY Reducing Copper Coupling Fitting Straight with Sweat End, 3/8 x 1/4 Inch ID for HVAC Refrigeration Adapter, Pack of 5 - Amazon.com