So we have the standard DWV pipes outside of our house, two of them,
one goes towards the street and the other towards the house (they
actually go straight down and hook up with the actual sewer line).
Long story short, we had to saw them off and re-cap them. I measure
them, they are 3.5" O.D., I go to the hardware store, the guy sells me
3" and 4", says 3.5" doesn't exist, I must have measured wrong.
Wrong, 3.5" does in fact exist, 4" is to big, 3" is too small.
Called three other plumbing stores, nobody has ever heard of 3.5" DWV
pipe, so now I have two waste pipes sticking out of the ground with no
caps on them.
Anyone heard of 3.5" and know where I can get the caps with the
cleanout plugs in them?
3-1/2" OD is going to be 3" schedule 40 PVC. The store
probably sold you schedule 20 DWV pipe fittings. Are the
fittings extremely thin?
Also, there are fittings designed to go onto the pipe and
there are fittings designed to go into a fitting such as a
coupling. Make sure you get the right type as well as size.
thanks for the reply. Actually, the pipe itself is very think, but it
is sch 40, says so right on the pipe. it is 3.5" O.D. and just under
3.25" I.D. I actually took a chunk of the pipe (that we sawed off) to
the plumbing store...nothing in the store fits it.
Is the pipe plastic or metel are you trying to put it in the hub or on
the spiggot or pipe end there is to my knowledge no 31/2 or33/4 pipe
Ive been plumbing for 30 yrs and have just about seen it all post a
picture I can tell you what it is
I've never seen or heard of 3.5" PVC pipe. Is it plastic, metal, or some
other material (clay, etc.)? Is it white PVC, Black ABS, or some other
colored plastic pipe? Is it rigid or semi-flexible like the black poly
I know there are minor differences between "DWV" pipe (used for sewer
lines) and "Drainage" pipe (used for foundation and other landscaping
drains). But, I do not know the exact measurements of each.
Maybe you could use a 3" or 4" Fernco style cap? They're made of rubber
with a clamping band. They'll stretch a little bit to go over bigger pipe,
or you can tighten the clamp down to fit a slightly smaller pipe.
I recently had to use a 1-1/2" Fernco cap to cap an old 1-1/4" galvanized
line while we were remodeling, and it actually worked quite well. Not the
ideal solution, but if you can't find the proper fitting...
Her Husband needs to contemplate this question. "Why would anyone make pipe
of a dimension that there would never be any fittings for?" I suspect they
have just made an error in measurement i.e OD versus ID. I'm betting it's 3"
PVC or maybe ABS if it's plastic at all.
Like you, I'm betting it's a common pipe size that standard fittings will
work with. But without a picture or detailed explanation, who knows what he
has. People don't always use the appropriate materials for the job. If it's
3" PVC, it should say something like 3" Schedule 40 DWV stamped all along
the side. Most fittings have the size stamped in them as well.
The original poster said he took the pipe to the store and nothing would
fit it. His words, not mine. Rather than just saying "you're wrong", I
suggested a possible solution.
Based on my personal experience, the dedicated plumbing supply stores don't
necessarily have any better selection than the home centers. Although, I
have had to turn to online sources (like www.plumbingsupply.com) for more
uncommon fittings (i.e. a 2" brass tee).
Also, just because pipe and fittings were in use at some point, doesn't
mean they're still available today, or available locally.
In any case, if you can't find it locally, and you can't find it online,
what other options do you have? You either come up with another solution,
or you leave it uncapped.
It is green sch 40 DWV pipe. 3" does fit inside of it, very loosely.
the O.D. of the pipe is 3.5", the I.D. of the pipe is about a 32nd
under 3.25". I did take it to a plumbers supply store (ABC Supply),
the guy helped me and out said he had never seen anything like it
before in his life but did confirm it was a 3.5" sch 40 pipe.
I was hoping someone out there had seen this...Being that this house
was built by Lennar (formerly US Homes) there is not a single thing
you could show me anymore that would suprise me, unfortunately.
Thanks for all the assistance and ideas, I think a rubber type of cap
is what I am stuck with.
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