Step 7 · Install the Transition Couplings
Loosen the band clamps on the two shielded transition couplings. Slide one coupling completely onto one of the cast iron pipe ends. Then, slide the second coupling onto the other cast iron pipe end. Insert one end of your cut PVC pipe into the first coupling until it hits the internal stop. Now, slide the second coupling back off the cast iron pipe and onto the other end of the PVC pipe until both pipes are seated against the stop. Ensure the metal shield of the coupling is centered over the joint. Using a torque wrench or nut driver, tighten the band clamps on each side of both couplings to the manufacturer's specified torque (usually 60 in-lbs). Alternate tightening the clamps to ensure even pressure.