WEBVTT

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You've just seen the main soil
and vent pipe to this property

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That pipe goes right up onto the roof and the fowl
gases escape through the vent at the top there

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You've also seen the trench that contains the new soil and vent pipe
that we've installed and that's so that we can put this toilet in

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into the new bathroom here and beyond that
the pipe then goes up into the room above

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which we'll see in a moment where we're going
to install another toilet. This particular

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soil and vent though because we have one
already that goes to the vents right the way

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through the roof into outside air this particular
soil and vent pipe can have something called

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an air admittance valve on top of it and this
air admittance valve when the toilet is flushed

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The valve opens within here and the air is
sucked in through that valve down the pipe

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and kind of chases the effluent out into the
manhole and the foul gases can then escape

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up the main soil and bent pipe
through the roof and out to open air

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This valve then shuts allowing no
foul gases to come back into the room

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I'll explain that more fully when we get upstairs that
that's the air admittance valve that we're going to put on

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upstairs. So we're upstairs now where the new
soil and vent pipe comes through the floor

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It's going to be extended by a piece of grey
plastic. I don't have any more grey plastic at the

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moment. Grey pipe is used out of the ground,
brown pipe in the ground. So we can demonstrate

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with a piece of brown for now. The soil and vent
pipe is going to continue up this wall. We're

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going to put a couple of bends on so that gets closer to the wall And then the dergo valve or the air air of mintants
valve goes on top of the pipe This particular air admittance valve is solvent weld so we will put some solvent

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weld adhesive on the inside of that collar and on
the outside of the grey pipe when we've cut it

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and that will sit on there, twisted a
couple of times and that will be set solid

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The whole thing then goes down onto the
stand pipe that we've got there, the sort of

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oil invent pipe that we've got there. When
the chain is flushed, this valve senses the

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vacuum that's being caused by everything
running down the pipe and the valve opens

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You can actually hear it. You can hear the valve.
The valve opens when it feels that water's

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being sucked or air is being sucked away from it. It
opens and it allows fresh air to come into the pipe

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so the vacuum that would be created is allowed to
move along because there's air coming in behind it

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The minute that stops running, that valve shuts again so that, and
none of those foul gases can escape out of this particular valve

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They will all then go to the soil and vent
pipe that goes out of the roof and escape

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The termination of this air admittance valve should
be above the highest outlet in your bathroom plumbing

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The highest outlet is normally the
overflammal. to a hand basin in the bathroom

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So this air admittance valve should be a little bit
above that. Okay, so that's an air admittance valve

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That's how it works and why we install them.
It saves you putting a soil and vent pipe

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a secondary soil and vent pipe, right up
through the roof and into the roof again

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This will allow the foul gases to escape
through the main soil and vent pipe

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but it will allow air in to make
sure that that process runs smoothly

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An air admittance valve being
installed by DR by ductal