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Old 03-03-2011, 09:24 AM   #1
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Default Drum Traps

Just curious....

Why were drum traps so popular back in the day?

Is there any advantage over a P trap?
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Old 03-03-2011, 10:07 AM   #2
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Quote:
Originally Posted by pauliplumber
Just curious....

Why were drum traps so popular back in the day?

Is there any advantage over a P trap?
I have often wondered this as well PP, they are prohibited by code here as they have been as long as I've been in the trade I think. I see the odd glass bottle trap under old lab benches etc. In schools and hospitals, but don't think I've ever laid eyes on a drum trap in real life.
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Old 03-03-2011, 10:34 AM   #3
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Quote:
Originally Posted by pauliplumber View Post
Just curious....

Why were drum traps so popular back in the day?

Is there any advantage over a P trap?
You have to realize what was at the end of a tub on legs.
An exposed waste 1-3/8". The tee that went up to the overflow
also went below the floor to a waste line. There was no trap abovethe floor, if a P trap was installed below the floor it was a major task to disconnect the waste to clean it out or replace it. The inventors of the day made a trap Drum Trap which prevented sewer gas from entering the room, but also allowed a clean out flush with the floor.

IMHO THAT WAS THE REASON FOR THE DRUM TRAP.

PS You can still buy them today in PVC/ABS from NIBCO although
the lid would not be flush with the floor.
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Old 03-03-2011, 11:11 AM   #4
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There's alot of old homes where I live and all of them have drum traps. I see them on tubs, lav, kitchen and laundry sinks. Almost everything in old homes here has a drum trap.

I used to always replace a drum trap with a new plastic drum trap, thinking there must be a reason for the original. I thought maybe if a fixture wasn't vented properly (like in ALOT of very old homes) a drum trap would help. Lately I've been replacing them with p-traps as they are code and about 1/5 the cost.
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Old 03-03-2011, 11:19 AM   #5
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Maybe they were like interceptors.
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Old 03-03-2011, 04:57 PM   #6
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Until a few years ago they were required on all lavs in the state of Maine. Story is that years ago the Governors wife lost her diamond ring down a lav drain at a rest stop on 95. The lav had a drum trap and they were able to recover the ring. The Governor was so impressed that he leaned on the plumbers board to make drum traps the law of the land. Personally, I think the story is BS. I suspect it had more to do with some buddy selling drum traps.
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Old 03-03-2011, 06:23 PM   #7
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I myself have never seen one. They are against code anyways.
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Old 03-03-2011, 06:58 PM   #8
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Plumber Bill has it right. Claw foot tubs and accessability for cleaning. They are very common around here in brass and cast iron. They work well until they get too corroded and split or leak. Some of the brass that I've seen are still in unbelievably great condition. If maintained they provide a great access for snaking the drains and removing hair clogs in old drains. Drum traps are still allowed in some areas as long as they are 3" or 4". They may appear to be awkward but the design is sound with the exception that they clog up easier than conventional p-traps.
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Old 03-03-2011, 08:59 PM   #9
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we pulled a lead drum trap out a couple months back. It trapped the leg tub and the lav. Had double 1 1/4" inlets and a 2" outlet, all lead. I love that old crap.
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Old 03-03-2011, 09:06 PM   #10
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Quote:
Originally Posted by nhmaster3015
we pulled a lead drum trap out a couple months back. It trapped the leg tub and the lav. Had double 1 1/4" inlets and a 2" outlet, all lead. I love that old crap.
Thats wild, only lead I ever saw was in tradeschool
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