Are Toilet Flanges Standard Size

These rings will prevent the toilet from properly recessing into the flange.

Are toilet flanges standard size.

One common standard toilet flange size is 4x3 and this is the measurement you will find beside most flanges available at your hardware or plumbing stores. That is so the flange mounts to standard 3 inch drain pipe schedule 40 used in almost every residential home today. The ring has slots for the bolts that hold the toilet down. This is the size of the flange opening and outlet.

Some flanges just have one diameter typically 3 inches. The top side of the flange which connects to the toilet is 4 inches in diameter while the bottom diameter of the pipe is 3 inches. A 4 x 3 toilet flange has a four inch topside and a three inch bottom diameter. The 4x3 size refers to the two diameters in the flange pipe.

The flange pipe can have a diameter of either 3 or 4 inches depending on the size of the waste line but a 4 inch hole works in both. The top section of the flange that connects to your toilet has a 4 inch diameter while the outlet below this has a 3 inch diameter. In addition a 4 x 3 toilet flange is the size of most closet bend pipes. A few other flange sizes exist as well.

The bottom of this size flange will fit standard sized drain pipes. The first thing you ll want to do when replacing or readjusting the height of your flange to shut your water off and remove the toilet from the floor. If you are not certain about your toilet pipe size this flange would be appropriate to use.