Prepare Pipe Ends and Install Couplings — Install the Shielded Flexible Coupling
Part of project
How to Connect a PVC Drain to a Cast Iron Pipe · Step 7 of 9
In this video
After removing the old pipe, the plumber prepares the remaining cast iron stack for the new fittings. He uses a strip of emery cloth to sand and clean the cut ends of the cast iron, removing any rust and burrs to ensure a smooth surface for a proper seal. He then slides two 3-inch Fernco flexible couplings onto the cast iron pipes, one on the top section and one on the bottom, pushing them out of the way to allow for the installation of the new PVC section.
Goal: Plumbing Pipes Repair
- A clean, smooth surface on the old pipe is essential for achieving a watertight seal with the new flexible couplings.
Used in this video
- Emery Cloth (Tool Type: Hand Tools, Abrasiveness: Medium) — Sanding and cleaning the cut ends of the cast iron pipe.
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FAQs
What are the most important safety precautions when cutting cast iron pipe?
When cutting cast iron, always wear 3M Professional Chemical Splash/Impact Safety Goggles, MCR Safety BearKat Safety Glasses, and a 3M P100 Household Respirator to protect against dust and debris. Cast iron is heavy, so ensure the pipe is well-supported with 2 in. x 4 in. dimensional lumber before and during cutting to prevent injury or damage.
Do I need a special blade for cutting cast iron with a reciprocating saw?
Yes, a standard reciprocating saw blade will not work effectively on cast iron. You will need a Milwaukee 12 Amp SAWZALL Reciprocating Saw equipped with a DIABLO 9 in. Diamond Grit Reciprocating Saw Blade for Cast Iron Cutting. This specialized blade is designed to cut through the hard material efficiently and safely.
How do I properly support the cast iron pipe to prevent it from falling after I cut it?
Before making your cut, use 2 in. x 4 in. dimensional lumber to create temporary supports on both sides of the cut line. Secure these supports to a stable surface, ensuring they can bear the pipe's weight and prevent any movement, cracking, or collapse during the cutting process.
Why is a shielded flexible coupling recommended for connecting PVC to cast iron, and how do I install it correctly?
A shielded flexible coupling creates a durable, leak-free seal between cast iron and PVC, accommodating slight differences in pipe diameter and vibration. Ensure both pipe ends are clean and deburred before installing the coupling, then tighten the stainless steel bands evenly to the manufacturer's specified torque using a TEKTON 7/16 in. Nut Driver.
Prepare Pipe Ends and Install Couplings — Install the Shielded Flexible Coupling
Part of project
How to Connect a PVC Drain to a Cast Iron Pipe · Step 7 of 9
In this video
After removing the old pipe, the plumber prepares the remaining cast iron stack for the new fittings. He uses a strip of emery cloth to sand and clean the cut ends of the cast iron, removing any rust and burrs to ensure a smooth surface for a proper seal. He then slides two 3-inch Fernco flexible couplings onto the cast iron pipes, one on the top section and one on the bottom, pushing them out of the way to allow for the installation of the new PVC section.
Goal: Plumbing Pipes Repair
- A clean, smooth surface on the old pipe is essential for achieving a watertight seal with the new flexible couplings.
Used in this video
- Emery Cloth (Tool Type: Hand Tools, Abrasiveness: Medium) — Sanding and cleaning the cut ends of the cast iron pipe.
Frequently Asked Questions
What are the most important safety precautions when cutting cast iron pipe?
When cutting cast iron, always wear 3M Professional Chemical Splash/Impact Safety Goggles, MCR Safety BearKat Safety Glasses, and a 3M P100 Household Respirator to protect against dust and debris. Cast iron is heavy, so ensure the pipe is well-supported with 2 in. x 4 in. dimensional lumber before and during cutting to prevent injury or damage.
Do I need a special blade for cutting cast iron with a reciprocating saw?
Yes, a standard reciprocating saw blade will not work effectively on cast iron. You will need a Milwaukee 12 Amp SAWZALL Reciprocating Saw equipped with a DIABLO 9 in. Diamond Grit Reciprocating Saw Blade for Cast Iron Cutting. This specialized blade is designed to cut through the hard material efficiently and safely.
How do I properly support the cast iron pipe to prevent it from falling after I cut it?
Before making your cut, use 2 in. x 4 in. dimensional lumber to create temporary supports on both sides of the cut line. Secure these supports to a stable surface, ensuring they can bear the pipe's weight and prevent any movement, cracking, or collapse during the cutting process.
Why is a shielded flexible coupling recommended for connecting PVC to cast iron, and how do I install it correctly?
A shielded flexible coupling creates a durable, leak-free seal between cast iron and PVC, accommodating slight differences in pipe diameter and vibration. Ensure both pipe ends are clean and deburred before installing the coupling, then tighten the stainless steel bands evenly to the manufacturer's specified torque using a TEKTON 7/16 in. Nut Driver.