I have an external ABS plumbing vent pipe in need of being
rerouted around a window. Project seemed easy enough, just get
some ABS pipe, elbows, cement. Now I'm finding ABS nearly
impossible to locate. Big box stores like Lowes and HD don't
stock it. Ditto for plumbing supply stores.
Is there a way to transition ABS to PVC? At least then PVC
components would be available.
I think it depends on where you are located. Individual Home Depot and
Lowes stores sometimes stock different items (and intentionally don't stock
others) based what the local codes in their town request or allow. For
example, one store may state, "We don't stock XYZ product because local
codes do not allow it to be used." I think that they do that in some towns
for "political" reasons and to keep the peace with local code officials,
even though I think they could legally sell whatever they want in any store.
I can't imagine a plumbing supply place not selling ABS.
Where are you located?
Long Island, NY
Plumbing supply store said they don't stock ABS any more and they
are the largest plumbing supply in the area. They did say some
HVAC suppliers might but being a holiday weekend it seemed wise to
begin checking alternatives.
The preference for ABS vs PVC seems to be a regional thing. Around here
(Washington State) ABS is the norm and it's rare to find PVC. But, I still
chose PVC which was only stocked at Lowes stores.
If you could track down a single ABS fitting, you could use a male ABS
adapter with a female PVC adapter and thread them together. Or the other
way around (male PVC to female ABS).
Otherwise, your best bet would be a Fernco style coupling. These are rubber
couplings you slip over the end of each pipe and tighten down two large
band clamps. They're used frequently for joining different types of pipe
and for joining nohub cast iron.
I used PVC for our drain plumbing, but didn't want a big white pipe
sticking out of the roof. So I used a fernco coupling to transition to a
short piece of ABS pipe. I didn't have the vertical space needed to use the
One final thing to think about... As far as I know, standard PVC does not
have any UV protection built-in, so the pipe could become brittle and break
down in exposed sunlight. You may need to paint the pipe to protect it.
Since the whole idea behind a vent is to allow air into the drain piping
so that the draining water doesn't suck the P-trap dry, you may be able
to use an air admittance valve here instead of running that vent around
Air admittance valves are used exactly for situations like this where
using a vent pipe isn't practical.
An air admittance valve has to be down stream of, and at least 4 inches
above the p-trap, but check your local plumbing code. Your local code
may be different.
I agree, and in a bathroom you can always put the AAV in the wall behind
the medicine cabinet. But, this is a kitchen and there typically isn't
anything a person could hide the AAV behind. So, in this case, I think
he'd just have to settle for it being as high up under the counter top
Canada may permit you to put an AAV in a wall. In the USA, it is _NOT_
permitted unless you have a panel, even then, depending on the local code,
it may not be allowed. I know for a fact you cannot put one behind a
medicine chest in the USA.
On Saturday, July 6, 2013 9:57:05 AM UTC-7, HerHusband wrote:
I am in Eastern Washington state, town of 2,000. We have 3 different stores (Ace, Grange, and lumberyard) each has racks of both ABS and PVC.
Good point about the sun damage. I was going to warn him if no one else did.
That must be nice. I'm in SW Washington state (near Portland, OR). Home
Depot, all of the small hardware stores like Ace and DoItBest, and even the
dedicated plumbing store only stock ABS pipe (for DWV pipe). Lowes is the
only place I have been able to find PVC locally.
I chose PVC because I was already familiar working with it for supply
plumbing, and the only time I used ABS I had a leak (probably just
coincidence, but I didn't want to chance it). It also seemed like ABS was
being phased out in other parts of the country, and I seem to remember
reading something about PVC being stronger (not that you really need
strength for a drain pipe).
I've never really heard whether ABS has UV protection, but it's sticking
out of every roof in the county so I figured it would be OK. :)
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