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 > Cheater Vent - Air Admittance Valve

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Freep

Wisconsin

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Posted: 08/23/20 12:24pm Link  |  Quote  |  Print  |  Notify Moderator

The air admittance valve(AAV) also known as a cheater valve was not closing properly in my TC and was stinking up the place. I sealed it off since I already have a vent on the roof. Now I'm wondering, do I really need an AAV? I don't have one under the sinks in my house and they work just fine and water flowed into the gray tank without issue when I sealed it up during our trip.

Opinions and experiences welcome.


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Lwiddis

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Posted: 08/23/20 12:57pm Link  |  Quote  |  Print  |  Notify Moderator

Any issues after sealing?


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vermilye

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Posted: 08/23/20 02:22pm Link  |  Quote  |  Print  |  Notify Moderator

It depends on the run from your sink to the gray tank. If there is not enough ventilation, a large stream of drain water will siphon out the sink drain trap, letting gray tank gas out the drain. If you can let a large volume of water drain out of the sink without starting a gray tank stink in the sink, you may not need it. In most cases, it is there for a reason...


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gbopp

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Posted: 08/23/20 02:42pm Link  |  Quote  |  Print  |  Notify Moderator

The AAV is not there to vent your holding tank. It's there to ensure a smooth flow of water and not drain the traps.
vermilye is correct, they are there for a reason. If you can get away with no AAV and cause no problems, good.
Personally, I would replace the valve. You may be okay today but, could have problems when you're boondocking out in the sticks.

ticki2

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Posted: 08/23/20 02:56pm Link  |  Quote  |  Print  |  Notify Moderator

Agree with the others . You won't necissarily know which trap it drains if it happens , kit sink , bath sink or shower . You also won't smell it immediately , you may go to bed and wake up to it . They are cheap .


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bdpreece

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Posted: 08/23/20 03:34pm Link  |  Quote  |  Print  |  Notify Moderator

Do you really think a manufacturer would spend one cent extra unless it was absolutely necessary?


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BB_TX

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Posted: 08/23/20 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

Freep wrote:

.............
Now I'm wondering, do I really need an AAV? I don't have one under the sinks in my house and they work ............

You have vent pipes to the roof in the walls of your house behind sinks to prevent the siphoning. That’s different than tank vents.

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Posted: 08/23/20 04:32pm Link  |  Quote  |  Print  |  Notify Moderator

I would consider running a vent from that point to the roof or semi lateral to the existing vent.


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wnjj

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Posted: 08/23/20 06:47pm Link  |  Quote  |  Print  |  Notify Moderator

BB_TX wrote:

Freep wrote:

.............
Now I'm wondering, do I really need an AAV? I don't have one under the sinks in my house and they work ............

You have vent pipes to the roof in the walls of your house behind sinks to prevent the siphoning. That’s different than tank vents.

Yep. The air pushed ahead of the draining slug of water enters the tank and exits through the vent, along with the air that the water displaces. The air that follows behind the slug of water needs to come from somewhere other than through the drain p-trap.

Kayteg1

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Posted: 08/23/20 08:31pm Link  |  Quote  |  Print  |  Notify Moderator

bdpreece wrote:

Do you really think a manufacturer would spend one cent extra unless it was absolutely necessary?


Yes and that is pretty obvious when bureaucrats make building codes.
In USA we have lawyers dictating engine oil changes as Mercedes case from 2002 shows. [emoticon]
In my Sprinter conversion gray system I have no pipe vents and no P-traps with only 1/2" vent for gray water tank.
When you make sink/shower outlet going down to bottom of the tank- you can avoid P-traps.
Pipe vents are potential need when you have several sinks on the same pipe.





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