View Full Version : Is this an s-trap problem
elpeacen
Nov 21, 2012, 03:38 AM
After p-trap, waste pipes goes level for 6 inches, then drops about 3 inches before going into walls, under bathroom sink. Is that a danger of s-trap siphoning if large volume goes down sink drain? Is this an S-trap? Or is it safe because of the level 6 inches of pipe?
massplumber2008
Nov 21, 2012, 06:04 AM
If the Ptrap doesn't connect into a vent then yes, you have an Strap there. To resolve this you could connect a mechanical vent (called an AAV.. air admittance valve) just after the Ptrap and that would fix the issue.
Mark
speedball1
Nov 21, 2012, 06:45 AM
And here's how it looks,(see image) Good luck, Tom
elpeacen
Nov 21, 2012, 09:54 AM
Thank you very much.