Shielded 4" transition coupling, Joins Plastic, Steel, or Extra Heavy Cast Iron | eBay
Style 413 | Steel Transition Coupling
The Plumber's Choice Shielded 1-1/2 in. Transition Coupling Connects Cast Iron, Plastic, or Steel to 1-1/2 in. Copper or 1-1/4 in. Plastic H-38337 - The Home Depot
How to transition from cast iron to PVC for tub drain? : r/Plumbing
Best place to transition from galvanized to PVC | DIY Home Improvement Forum
How Can I Connect Other Materials to Ductile Iron Pipe? - McWane Ductile - Iron Strong
Series 732 Transition for Ductile Iron Size PVC/HDPE - Poly-Cam, Inc.®
Pace Supply | Transition Coupling, 1-1/2 x 1-1/4 in, Cast Iron/Plastic x Cast Iron/Plastic, Flexible PVC
Pace Supply | Transition Coupling, 4 in, Cast Iron/Plastic x Cast Iron/Plastic, Flexible PVC