Fernco 3 in. x 3 in. PVC DWV Mechanical Flexible Coupling P1056-33 - The Home Depot
1056-075 - Fernco 1056-075 - 3/4" x 3/4" Condensate Rubber Flexible Coupling (PVC to Copper)
Drain Coupling, 3 to 2 In. Straight Adaptor, PVC Rubber
Fernco Inc. P1006-43 4-Inch by 3-Inch Flexible Coupling For Concrete To Cast Iron Or Plastic - Pipe Fittings - Amazon.com
Fernco 1056-32 Reducing 3-in. x 2-in. Flexible PVC Pipe Coupling for Cast Iron and Plastic Plumbing Connections in Black - Hydraulic Couplings - Amazon.com
Fernco 4 in. x 4 in. PVC DWV Mechanical Flexible Coupling P1056-44 - The Home Depot
Rubber Coupling, 3-Inch – AERO Specialties
Fernco 1056-43W Reducing 4 x 3 Inch Flexible Pipe Coupling Plumbing Plastic PVC ABS, Cast Iron, Lead in White - Amazon.com
3007-33 - Fernco 3007-33 - 3" x 3" ProFlex Coupling (PVC, Steel, Extra-Heavy Cast Iron to Copper)