Originally Posted By: rwand1
This post was automatically imported from our archived forum.
I have seen these Air Admittance Valves placed on the horizontal section of the waste line. Most always installed in modified plumbing systems in older housing.
Most times I will flush the toilet or run shower/bathtub to try and hear if there is any gurgling fom the sink or bathtub. It is not uncommon to hear this in older homes with S-traps.
The auto-vent seems to be a good work-around, but I can't say as to how you would test it and ensure it works? Let alone the manner it which it is installed in some cases. Just because you don't hear any gurgle is not a guarantee of no problem.
The value of experience is not in seeing much,
but in seeing wisely. - Sir William Osler 1905
Registered Home Inspector (OAHI)