How to Connect Ductile Iron to PVC

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Ductile iron, developed in the 1940s, is comparatively flexible when compared to other cast irons. Plumbers usually simply call it cast iron and use the metal mostly to plumb vents, drains and waste lines. Most of the rest of a house’s plumbing is usually either PVC or copper tubing, so inevitably you have to join pipes made of different materials. You can jolin iron and PVC pipes with outside diameters under two inches with a “compression coupling.” You can join pipes of all sizes with a “no hub coupling.”

Things You'll Need

  • Adjustable pipe cutter
  • Chain pipe cutter
  • Compression coupling wrench (for compression couplings)
  • Socket wrench or screwdriver (for no hub couplings)
  • Square the PVC pipe on the PVC side of the joint with an adjustable pipe cutter. Cut the ductile iron pipe with an adjustable chain pipe cutter where you intend to make your joint.

  • Slide the end nuts from a compression coupling onto each pipe. Slide the compression gaskets onto the ends of both pipes and slide the compression coupling onto the end of both pipes to make the joint.

  • Tighten a compression coupling joint by tightening both end nuts with a kind of spanner wrench called a compression coupling wrench.

  • Loosen the worm strap screws on a no hub coupling with a socket wrench or screwdriver. Depending on the coupling you may need to use either tool to loosen or tighten the worm straps.

  • Slide both pipes into the no hub coupling. Tighten the worm strap screws with a socket wrench or screwdriver to seal the coupling.

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