What is it with all these air admittance valves we are seeing - even on brand new homes? We have been called out to a number of them out east Auckland with the toilet not draining correctly - always installed the same way...just plain lazy or untrained....maybe I should post this in the rant/rave section 

Linkback: https://www.plumbers.nz/dodgy-plumbing-or-great-plumbing/4/air-admittance-valves/2018/

Hey that is a little beauty orrite, apart from what you have mentioned, the waste on the left that comes out of the ground and over the top of the gully?? no seal on the rear gully waste penetration
 I gather that there was no terminal vent on the drainage system at all.
What other horrors lurk boggles the mind.
 What muppet signed this off i wonder.... what  certifyer bears the responsibility...

Yep dodgy and non compliant if used for upstream venting of a main drain AS/NZS 3500.2-  9.9.1  and protected from ultra-violet rays if installed outdoors,  6.9.4 (g)