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48851

This photo is a perfect example of the problem with dry horizontal venting below the flood level of a fixture.......

Yes, Jeff that is an s - trap and it has the potential to syphon. A toilet is designed to syphon and will do so even though its vent is usually only 6 or 8 inches away. A dry trap will let foul...

48132

Mike, I have never worried about it in any way and I've never had an inspector even discuss it with me (and I have roughed in thousands of units... no exaggeration), so I'm not going to give...

Mark,

Dry horizontal vents installed below the flood level of fixtures have the potential to become clogged; when this happens the vent will not prevent negative pressure. Although rare, I have...

I think its odd that AAVs are not allowed in WI, but the installation demonstrated in the photos clearly shows a horizontal vent below the flood level of the bathtub - no code that I am aware of...