#1 Best TUUBER Dual-Seal Air Admittance Valve Test Review.
- EXCELLENT the most well constructed valve.
 - PASSES the smash test with no problem.
 - EXCELLENT Inlet flow.
 - EXCELLENT positive pressure resistance test.
 - HIGH Intake flow attenuation.
 - SAFE does prevent and protect against sewer gas from escaping when subjected to room vacuum pressure.
 
The TUUBER air admittance valve is #1. It is the best test review for safest valve.

