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Posted by on October 21, 2009, 9:46 am
> On Wed, 21 Oct 2009 05:27:19 -0700 (PDT), trad...@optonline.net wrote:
> >> >Hi,
> >> >My washer is basically at the same level as the main stack (or whatev=
er
> >> >its horizontal equivalent). So there is not sufficient elevation to h=
ave
> >> > =A0 a p-trap on the exhaust (take my word for it - I just can't do i=
t).
> >> >So I bought a check valve at HD. I think it's intended for a sump pum=
p.
> >> >Will it solve my problem?
> >> No - if it is a check valve, it will catch lint, clog & never shut
> >> properly after about a week of use.
> >> This is what you want-http://www.hardwareandtools.com/invt/6833156
> >> HD carries them as a "cheater vent" =A0 =A0- =A0 Put it on the top of =
the
> >> pipe that your washer drains into- and sani-T the drain hose. [there
> >> should be directions showing installations in the package]
> >> Jim
> >That solves the problem of not being able to have a vent pipe on the
> >drain where it is located and works with a P trap. =A0It does not
> >eliminate the need for a P trap, which is what the stated problem is.
> I am not a plumber-- and I know some codes don't allow them. =A0 But
> they work fine as a vent, and don't allow sewer gas into the house.
> [the latter being the purpose of the p-trap, right?]
They work as a vent in COMBINATION with a p-trap. In an installation
with a p-trap and conventional vent pipe, the water in the p-trap
blocks the gases from coming into the house through the drain and the
vent pipe gives the gases an alternate low pressure exit out the
roof. The device you recommended, commonly called an air admittance
valve, is used where you can't provide a nearby vent pipe, like a
kitchen island sink. It allows air in, to prevent a vacuum from
forming and allowing water to flow normally. It will not allow waste
gases to come out through the valve in the reverse direction. But
the gases will still flow right out of the drain if there is no p-trap
filled with water. Also, the air admittance valve depends on there
being some other actual vent pipe in the system.
> >He says there is not sufficient elevation for a P trap, for which I
> >think we need more explanation..
> I agree here- a picture of the setup would probably elicit a 1/2 dozen
> ways to attack the problem.
Yes, since the typical washer can pump probably as high as the
ceiling, it would seem a p-trap should be able to go somewhere.
> Jim- Hide quoted text -
> - Show quoted text -
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>My washer is basically at the same level as the main stack (or whatever
>its horizontal equivalent). So there is not sufficient elevation to have
> a p-trap on the exhaust (take my word for it - I just can't do it).
>So I bought a check valve at HD. I think it's intended for a sump pump.
>Will it solve my problem?