whats this

doesn't having it above the spill level just mean it will be the sink puking up nasty stuff rather than the aav?

I guess the idea is that you will see that earlier and do something about it?
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it's more that you may not notice a boxed in or concealed AAV may be leaking like a sieve - you are likely to notice that the pan or basin isn't draining
I had a thought about this last night, does the valve open due to a vacuum in the system? as the pipe has a hole drilled through it where the cable runs would this effect the operation of the valve?
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the cable thing, I couldn't believe what I was seeing!
I can - I had the same on a soil pipe on a job - that was on the wet side :eek: it was letting water dribble out in a ceiling void , that brought part of the ceiling down .

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