1. 

   rice9923 New Member

   Joined:

   Apr 13, 2005

   Adding a new drain which consists of two sinks in my basement.
   Do not have access to the existing vent system. I must run a new
   vent to the outside of my house for this system.
   QUESTION: What is the mininum diameter pipe that can be used for this vent?
   
   thanks,

    

   rice9923, Apr 14, 2005

   #1
2. 

   hj Moderator & Master Plumber Staff Member

   Joined:

   Aug 31, 2004

   Occupation:

   Plumber

   Location:

   Cave Creek, Arizona

   pipe
   
   1 1/2" in most cases.

    

   hj, Apr 14, 2005

   #2
3. 

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