How to Replace a Whole-House Plumbing Trap | This Old House

This Old House plumbing and heating expert Richard Trethewey shows tools and techniques for fixing corroded cast-iron pipe. (See below for a shopping list and tools.)
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Shopping List for Replacing a Whole-House Plumbing Trap:
– cast-iron pipe, fitting, and cleanout
– no-Hub couplings, used to join together cast-iron pipe and fittings

Tools for Replacing a Whole-House Plumbing Trap:
– soil-pipe cutter, used to cut cast-iron pipe
– 3-pound sledgehammer
– ball-peen hammer and 3/4-inch cold chisel
– torque wrench
– tape measure

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How to Replace a Whole-House Plumbing Trap | This Old House
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Comment (0)

  1. Dude said excavation. Hahahaha do a video of removing a house trap in wisconsin! Break 4×6 patch of concrete, dig 6-10 feet down, through either or all of gravel, clay, 100 year compressed dirt, and all soaked in s#!T water just to expose that ancient turd of a headache. And why replace with more cast iron? PVC?

  2. Rather than cut multiple sections of cast iron pipe and use multiple fernco coupling bands, why not just ave ABS or PVC in between with only two couplings to attach back to the original cast iron pipes? At least everything in between would absolute leak free (and yes, I realize these couplings are considered a permanent fix).

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