Step 7 · Install the Shielded Flexible Coupling
Take your shielded flexible coupling and confirm it is the correct transition size (e.g., 3" Cast Iron to 3" PVC). The outside diameters are different, so a specific transition coupling is required. Loosen the band clamps on the coupling with a nut driver or wrench. Slide the entire coupling assembly, including the metal shield and rubber gasket, completely onto one of the existing cast iron pipe ends. Next, fit the newly cut PVC pipe section into the gap, aligning its ends with the cast iron pipes. Finally, slide the flexible coupling back over the joint, positioning it so the rubber gasket is centered and covers both the PVC and cast iron pipe ends equally.