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Unwise to connect 11/4" drain to 11/2" trap?

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Unwise to connect 11/4" drain to 11/2" trap? kc 04-16-2007
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Posted by kc on April 16, 2007, 2:40 pm


I put in a new bathroom faucet. The drain has a 11/4" diamter tail.
The existing trap is 11/2". I was advised by the local hardware store
that to do the job right, everything should be 11/4" and not to use a
reducer in order to attach the 11/2" trap to the 11/4" sink drain.

I didn't think of it at the time, but wouldn't a 11/4" drain going
into a larger 11/2" provide for efficient draining? Or is keeping
everything the same size a good rule of thumb?


AppliancePartsPros.com, Inc.
Posted by Speedy Jim on April 16, 2007, 2:54 pm


kc wrote:

> I put in a new bathroom faucet. The drain has a 11/4" diamter tail.
> The existing trap is 11/2". I was advised by the local hardware store
> that to do the job right, everything should be 11/4" and not to use a
> reducer in order to attach the 11/2" trap to the 11/4" sink drain.
>
> I didn't think of it at the time, but wouldn't a 11/4" drain going
> into a larger 11/2" provide for efficient draining? Or is keeping
> everything the same size a good rule of thumb?
>

The 1 1/2" trap will be just fine.

Depending on the trap material, there is a rubber reducing washer
or a plastic one which the hdwr guy should have in stock.

Jim

Posted by Ook on April 16, 2007, 3:30 pm


I think the person at the h/w store is confused. There is no problems going
from a 1 1/4 drain into a 1 1/2 trap. For that matter, you could just as
easily go from a 1 1/2 drain into a 1 1/4 trap. In the case of a residential
sink in a bathroom or kitchen, it really makes no difference at all if the
pipes change from 1 1/2 to 1/1/4 here and there and back again.

>I put in a new bathroom faucet. The drain has a 11/4" diamter tail.
> The existing trap is 11/2". I was advised by the local hardware store
> that to do the job right, everything should be 11/4" and not to use a
> reducer in order to attach the 11/2" trap to the 11/4" sink drain.
>
> I didn't think of it at the time, but wouldn't a 11/4" drain going
> into a larger 11/2" provide for efficient draining? Or is keeping
> everything the same size a good rule of thumb?
>



Posted by buffalobill on April 17, 2007, 6:38 am


> I put in a new bathroom faucet. The drain has a 11/4" diamter tail.
> The existing trap is 11/2". I was advised by the local hardware store
> that to do the job right, everything should be 11/4" and not to use a
> reducer in order to attach the 11/2" trap to the 11/4" sink drain.
>
> I didn't think of it at the time, but wouldn't a 11/4" drain going
> into a larger 11/2" provide for efficient draining? Or is keeping
> everything the same size a good rule of thumb?

you may be just fine, but your hardware guy may be right also. i think
the same size design would help me now: i don't like my kitchen's
1-1/2" going into an old design 2" S-trap. it seems sluggish and
struggles to push the drain water thru even with an auxiliary vent.
i was the 1976 "plumber" and should have piped the tail into a 1-1/2"
p-trap first.
note that s-traps are not the usual recommended plumbing design these
days.


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