How to Replace a Bathtub Drum Trap | This Old House

This Old House plumbing and heating expert Richard Trethewey shows how to replace an old bathtub drum trap with a new PVC P-trap. (See below for a shopping list and tools.)
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Shopping List for How to Replace a Bathtub Drum Trap:
– PVC P-trap, used to replace existing iron drum trap
– 1 1/2-inch PVC pipe
– 45 degree and 90 degree PVC elbows
– threaded PVC male adapter, used to connect to existing iron pipe
– threaded PVC female adapter, used to connect to existing iron pipe
– pipe dope, for creating a watertight seal on threaded PVC fittings
– single-strand wicking, used to help seal threaded connections between PVC and iron fittings
– PVC primer and cement, for gluing together PVC pipes and fittings
– bucket, to catch drips and empty water from old drum trap

Tools for How to Replace a Bathtub Drum Trap:
– reciprocating saw fitted with metal-cutting blade
– pipe wrench, two large wrenches needed to disassemble the old iron pipe and trap
– PVC pipe cutter or hacksaw, used to cut pipe to length
– pliers
– tape measure
– indelible marker, for marking the alignment of PVC pipes and fittings prior to gluing
– pocketknife, used to remove rough burrs from the ends of just-cut PVC pipe.

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How to Replace a Bathtub Drum Trap | This Old House
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Comment (0)

  1. Wait… that copper fitting he threaded the female adapter too was a compression non-tapered thread. It appeared he threaded a standard 1.5” Female NPT to PVC Adapter, or is that not the case? If it were the case then this joint could leak. Granted it is a non-pressure down facing joint which will never have water sitting in the joint and he used thread sealant, but still. Also he has the ceiling open he should just rip out all those pipes and go to solvent welded PVC for every thing you can see there.

  2. This guy always does messy and botched up work. He used a knife to ream out the pvc , are you kidding me, if you're going to post it on YouTube, at least use the proper tools for crying out loud, and for the record i have never had a drum trap come out that easy,

  3. How high can water pressure push up the trap? I have one of these basin traps and it's a PITA. But I haven't replaced with a p-trap because it needs to be like 6 inches. Is this ok?

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