#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.