Things You Will Need
When remodeling, PVC is a popular choice due to its light weight, low cost and easy installation. Joining PVC to cast iron is also easy with the use of flexible couplings.
-
Turn the clamp nuts on flexible coupling counterclockwise until the coupling is loose enough to fit over the largest diameter pipe.
-
Slide the coupling over the end of the smaller diameter pipe. Slide the coupling up the pipe until it is flush with the end of the pipe.
-
Line up the ends of the two pipes. Slide the coupling until it sits halfway on each pipe with at least a 1-inch overlap on the pipes.
-
Turn the nuts on the clamp clockwise until the coupling is firmly attached to both pipes.
-
Run clean water through the pipes while checking for leaks. Continue tightening the clamp nuts until all leaks stop.