View Full Version : 5" inside diameter toilet flange - cast iron
11-28-2004, 10:38 AM
I have a 5" inside diameter toilet flange that's 1 1/2" deep that's connected to a 4" inside diameter cast iron waste pipe. The problem is wax rings are made for 3" and 4" openings. Is there a wax ring for a 5" opening or what do you recommend to reduce the opening to 4"?
Ken - Chicago, Il
11-28-2004, 01:33 PM
A regular wax should fit. The inside of 4" or 4 x 3 flanges are almost five inches. I have not hear of a 5" toilet flange.
11-28-2004, 03:03 PM
Although I never had this problem...
Instead of reducing the (closet flange) drain opening you would be better off combining a small section of a second wax seal to another one to make the diameter larger if that's what you need to do.
Apparently the 4" cast iron pipe is not long enough to reach the surface of the flange, the way it should. A plumber would caulk a section of pipe inside the flange so the new opening would be correct for a wax ring.
11-29-2004, 06:44 AM
What type of pipe do you recommend caulking in there? What will fit? A piece of iron pipe or PVC? I think if I reduced the opening down to an inside diameter of 4", the wax ring would give me a better seal in the long run so I don't have to repair the floor again. The plumbing guy at local Home Depot said this might be a commercial fitting that was put on my toilet.
I just talked to a commercial plumbing supply house. Apparently my situation is common plumbing technique in the Chicago area. The flange is 5" diameter with a 1 1/2" drop connecting to a 4" waste pipe. A regular wax ring should do the trick. Apparently, the original installation had a plumber's putty like consistency that reduced this 5" opening to about 4" (this material was very stiff and flaking) when I originally removed it.
The "5"" flange is really a 4" one, but the 4" pipe is too short. The best solution would be a 1 1/2" piece of cast iron pipe caulked, (leaded), into the flange to raise the 4" to the finish floor elevation. Failing that a piece of 4" ABS or PVC could be inserted and siliconed in place so it lines up with the existing 4" pipe.