They make a back check valve for that purpose. It don't let anything back, the problem though is that if there is some back pressure closing it off it won't let your sewage out either.
----- Original Message ----- From: chiliblindman To: [email protected] Sent: Thursday, May 29, 2008 2:35 PM Subject: Re:[BlindHandyMan] home sewer lines Removing traps in or near a main sewer line that is a common run by many other parties can make your line to it a weak point. If you are lower in elevation than others if there is a partial blockage below your location, all buildup will take a path of least resistance. A trap in your line will restrict back flow somewhat. ......................bob [Non-text portions of this message have been removed] ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.24.3/1472 - Release Date: 5/29/2008 7:27 AM [Non-text portions of this message have been removed]
