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Cut the Tailpiece — Measure and Cut PVC Replacement Pipe

Intermediate

Part of project

How to Replace a Cracked Section of Cast Iron Drain Pipe with PVC · Step 6 of 10

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In this video

Calculate the final length for the tailpiece by adding the two previously taken measurements together, and then adding an additional one and a half inches. Use a pipe cutter to cut the Schedule 40 PVC or ABS pipe to this precise length.

Goal: Cut the tailpiece to the correct size

Used in this video

  • Pipe Cutter (Tool Type: Plumbing Tools, Power Source: Manual)Cutting PVC or ABS pipe to the required length
  • Schedule 40 PVC/ABS Pipe (Material Type: PVC pipe, Purpose: Plumbing)The tailpiece that connects the tub drain to the floor drain assembly
43.0K views975 minutes
Roger Wakefield Plumbing Education

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FAQs

What are the main safety concerns when cutting cast iron pipe, and what PPE should I use?

Cutting cast iron creates heavy dust and sharp shards. Always wear a respirator, safety glasses or goggles, heavy-duty work gloves, and long sleeves to protect against debris and cuts. Ensure the area is well-ventilated.

Is a standard hacksaw sufficient for cutting cast iron, or should I use a different tool for efficiency?

While a hacksaw is listed and can eventually cut cast iron, it is very labor-intensive. For significantly easier and faster cuts, consider renting or purchasing a reciprocating saw with a metal-cutting blade or a specialized cast iron snap cutter.

How can I prevent leaks when connecting the new PVC pipe to the existing cast iron with shielded couplings?

Precise measurement and clean, burr-free pipe ends are crucial. Use the specified shielded no-hub couplings and ensure they are torqued exactly to the manufacturer's recommendations using a torque wrench. Over- or under-tightening can lead to leaks.

How long should I expect this project to take for an intermediate DIYer, and what's the most challenging aspect?

This project typically takes 4-8 hours, depending on access and your experience level. The most challenging parts are safely cutting the heavy cast iron pipe and ensuring the existing pipe is adequately supported to prevent collapse or further damage.