ABS Pro-Vent Anti-Siphon Valve 1-1/2"

Key Features:

• Help prevent sewer gas from entering your home while you vent your drain line with the Oatey 1-1/2 in. ABS In-Line Cheater Vent.
• This spring-loaded vent uses negative pressure to open and positive pressure to close.
• Also replaces secondary stack venting.
  
• ABS construction.
  
• Use to vent drain lines.
  
• Spring-loaded to open with negative pressure and close with positive pressure
  NSF-24 listing for use in recreational vehicles.