'Gargling' basin air admittance valve

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I have a basin making a 'gargling' noise. It looks like a 32mm (I think) S trap is fitted but space seems to be pretty tight under there. What's the best way to fit an air admittance valve?
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Might be best to tackle the cause. What other items are sharing the waste pipe?

Looks to be plenty of space for an anti-vac trap though.
 
You may get away with an All in one or offset anti vac trap, if not then change it for an antivac bottle trap. All you'll need then is a couple of pieces of 32mm and an elbow
 
I have access to the soil stack which the toilet and and basin connect - could I / should I use an external air admittance valve there?
 
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It depends what's causing the vacuum. As I asked before, what else is sharing that waste pipe?
 
From memory: basin, toilet and shower is on another branch that joins the main stack, but the gargling has been just when the basin tap is running.
 
Last edited:
Agree. Easiest to try an anti vac bottle trap in the sink. Looks like plenty of space there.
 
Thanks chaps.

Just one more thing... would one of these be better than a bottle trap?
 

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