This whole thing seems a bit much. But look how much bigger the red taped
pipe is compared to the vertical drain just under the sink. They had a 3"
pipe there for some other reason, and plumbed this sink to it.
I was thinking of the main fittings like the pipe nipple or the tee in the
main stack, rather than the P-trap assembly. For example,
plumbingsupply.com shows a 2" brass tee costing $38. Ouch. Of course, those
fittings are made for supply lines, not drains. I've never seen drain lines
made of brass (solid, not plated steel).
In any case, the only P-trap assemblies I have seen here in WA state are
PVC, ABS, or chromed steel. I could probably special order brass if I
wanted to, but it's not something available off the shelf.
I'm terrible at math, so I used an online calculator to find the diameter:
6" circumference = 1.91" diameter
Then I looked up the outside diameter of galvanized pipe:
1-1/2" galvanized appears to be closest to your 1.91" measurement.
That's a bit smaller than I expected. Dang, I guessed 2" pipe. :)
I knew it wasn't 3" based on the size of the bleach or vinegar bottle next
to it. The PVC tailpiece is usually 1-1/4 or 1-1/2, and the trap looks
larger than the tailpiece. The P-trap also looks like it reduces slightly
where it drops from the red taped area. 2" seemed the most likely.
I blame it on trick photography and/or photoshop. :)
It's one of those infinity photos where 3" pipe drains upward into a 1-
1/2" stack. :)
Thanks for clearing up the debate. Like trying to guess the number of
marbles in a jar, that was a fun side diversion. :)
On Tue, 24 Jun 2014 04:39:29 +0000 (UTC), HerHusband
The price list is available onlune. $40 ish for brass traps. That's
cast brass. The lightweight drawn brass are a lot less. $23 for one
from Home despot (see
On Tuesday, June 24, 2014 8:32:53 PM UTC-4, firstname.lastname@example.org wrote:
here. Some said to measure with a ruler..I went a step further by circling
it with a string, than lied it down a ruler and it measured 6". So half of
that, I believe would be the diameter...so do the math. It was circled arou
nd the red tape area cause that is where it was inserted into the T-pipe.
Regardless, a genuine plumber is coming today to take all out and replaced
with the latest P trap and etc, minus the T-pipe. Thanks to all...except th
e troll caller. LOL
3" galvanized $19.23 3" stainless $22.66 this is a no brainer, go
stainless and only do it once.
My guss is it's 2" which is about 2.5" o.d. and would look like 3"
under a sink.
Remove 333 to reply.
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On Wednesday, June 25, 2014 9:17:29 AM UTC-4, Randy333 wrote:
The rest of the plumbing system is 50 year old galavanized.
Why would you put a $22 stainless nipple into that, when the
rest of it isn't long for this world? Even a new galvanized is
going to last longer than the rest of the system.
Per his latest reports, the circumference is 6". That makes it
1.5" pipe. Good thing he didn't buy the 3" nipple, eh?
The distance around the outside of the pipe that you did with the string is
called the circumference. Here's a link about that:
The circumference is 3.14 times the diameter. If you divide the 6 inch
string length by 3.14, you'll get the diameter of the pipe straight across
from one outside edge to the other, which is a little less than 2 inches.
But, that is the outside diameter of the pipe and, as someone mentioned,
pipe sizes are stated by the inside diameter of the pipe. So, it is
apparently a 1 1/2 inch inside diameter pipe.
I'd bet that it wasn't cheap getting a plumber to fix the problem since it
appears from the photo that the trap may be brass and the other pipes and/or
stack may be cast iron. And, to make things more difficult, it looks like
the P-trap from the stack goes straight to the tailpiece coming down from
the sink -- meaning that it is a straight shot and it is not offset on one
side or another. That would mean that you would need an exact length
horizontal pipe and P-trap to fit that distance, and it is an old style trap
with a short turning radius. That can make things difficult. But, if the
vertical stack was cut out by the plumber as was suggested elsewhere here,
and maybe Fernco couplings were used, then the new P-trap could be adjusted
to be offset in a way that the P-trap connections could be adjustable to
accurately line up with the existing sink tailpiece.
And, if you were going to try to do the job yourself, it would probably have
been a little bit of a challenge because that would have involved cutting
off the stack (maybe with an angle grinder due to the tight space), doing
the Fernco trick, putting in a PVC Tee-type fitting and a new P-trap, etc.
Could be a bit of a mess in a very small work area.
Hopefully, it all worked out, but I'd bet it cost some bucks -- maybe 2
hours for a plumber plus parts (just a guess).
And, thanks for posting the photo -- that helped a lot.
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