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Can the drainage pipe be used as a socket fitting for a 4X3 closet flange?

April 26, 2017Closet drainage fitting flange pipe socket Used

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Can the drainage pipe be used as a socket fitting for a 4X3 closet flange?

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The inside diameter of the drainage pipe may not be reduced to less than 3 in. thus; the vertical portion of a closet stub which is 3 in. may not be used as a socket to solvent weld a closet flange. Additionally, if we consult table P3005.4.1 when the 3 in. drain pipe is used for a socket for the flange it reduces the interior dimension of the pipe to 2-½ in. and according to this table 2-½ in. pipe and footnote b, prohibits the use of a water closet. However, if the vertical portion if the closet stub is 4 in. then the drainage pipes may be used as a socket for a closet flange that is design to solvent weld inside the 4 in. drainage pipe.