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How to Replace a Toilet Flange

February 18, 2024 by admin Category: How To

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The toilet flange connects the bottom of the toilet bowl to the drain on the toilet floor. When the toilet has a leak under your feet, you may need to replace the toilet flange. After lifting the toilet from the flange, you will find that replacing the flange is not too difficult, but in some cases it may be a good idea to hire a plumber.

Table of Contents

  • Steps
    • Remove the toilet
    • Clean and inspect toilet flanges
    • Buy the correct replacement flange
    • Install new flanges and wax rings
    • Install the toilet in the right position
  • Advice
  • Warning
  • Things you need

Steps

Remove the toilet

Image titled Replace a Toilet Flange Step 1

Image titled Replace a Toilet Flange Step 1

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Place newspaper or rags on the floor next to the toilet. You will put the toilet on it after removing it from the flange. Leave enough space to work with the toilet flange, but keep newspaper or rags nearby so you don’t have to carry the toilet too far. [1] X Research Source

  • You can also place the toilet in a basin or a nearby bathtub, but the bottom of the toilet can scratch the ceramic tiles and/or the basin surface.
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Image titled Replace a Toilet Flange Step 2

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Turn off the water supply to the toilet. You should see an oval valve protruding from the floor or wall, behind to the left or right of the toilet. Turn this valve clockwise to close the valve. [2] X Research Source

  • If the valve is closed and the water is still not completely shut off, you must close one more valve on the line – it may be necessary to close the master valve near the water meter.
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Image titled Replace a Toilet Flange Step 3

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Drain and drain the water in the drain tank. Because the water supply valve is closed, the tub will not be refilled after you empty the toilet. Press the flush button again to clean the water in the tub. [3] X Research Sources

  • Use a vacuum cleaner or a large sponge to absorb any remaining water in the drain.
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Image titled Replace a Toilet Flange Step 4

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Remove the water supply pipe. This pipe connects the inlet valve and the drain tank, usually with an outer metal sheath. Remove this pipe at the junction with the underside of the drain tank. If you can’t unscrew it by hand, use pliers or a wrench to turn the coupling counterclockwise until it comes loose.

  • Some water will come out of the pipe, so you should have a towel ready to absorb.
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Image titled Replace a Toilet Flange Step 5

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Remove the 2 screws connecting the toilet to the floor. You will see these 2 screws on the left and right side of the toilet seat. They can be covered with a plastic lid, you just need to pry it up by hand. Then, use your hand or key or wrench to open the nut from the bolt (counterclockwise). [4] X Research Sources

  • Each nut usually has a metal washer underneath, it can also be a plastic one. You also remove the temple long.
  • New toilet flanges are usually sold with nuts, bolts and washers, but you should still keep the old ones in case you need them.
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Image titled Replace a Toilet Flange Step 6

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Lift the toilet off the floor and place it on newspaper or a rag. The toilet weighs about 32-54kg, so if you can’t lift it, ask someone else to help you. To lift alone, stand with your legs crossed, knees bent, grasp the underside of the toilet, and stand up straight (don’t use your back to lift). [5] X Research Sources

  • You need to raise the toilet vertically to get rid of the 2 bolts that pierced the base. After lifting the toilet, step aside to place it on the pre-lined newspaper or rag.
  • Residual water will come out when you move the toilet, so you need to prepare a towel to wipe it.
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Image titled Replace a Toilet Flange Step 7

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Use an old towel or shirt to stuff it down the toilet drain. Push a towel or shirt into this tube, but don’t stuff it too deep so you can pull it out later. Stuffing the end of the tube will prevent odors from evaporating. [6] X Research Sources

  • Some people do not rush to stuff the end of the pipe until the old flange is removed. However, if you stuff the block now, it will prevent odors early and avoid accidentally dropping objects there, like nuts, bolts etc..

Clean and inspect toilet flanges

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Image titled Replace a Toilet Flange Step 8

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Scrape the old wax ring with a plaster knife. The wax ring sits on top of the old flange and helps seal the connection between the flange and the toilet seat. Wax rings are often deformed and stained, but you can scrape them off with a plastering knife fairly easily. [7] X Research Sources

  • Have newspaper or rags nearby so you can clean the knife while you shave. The wax ring will burst into pieces.
Image titled Replace a Toilet Flange Step 9

Image titled Replace a Toilet Flange Step 9

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Remove the screws that attach the flange to the floor. The screws are caught over the edge of the flange and go down to the floor. Usually there will be 4 such screws. Use a screwdriver to turn the screw head counterclockwise to remove it. [8] X Research Sources

  • Keep these screws as a spare for the screws sold with the new flange.
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Image titled Replace a Toilet Flange Step 10

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Remove the flange if it is made of PVC and seal with washers. If it’s a PVC flange (the most common type), you can lift it out of the toilet drain after the screws are removed. Then rinse with water and wipe with a rag so you can see better. [9] X Research Source

  • If the flange is not cracked, chipped or deformed, you can reinstall it with a new wax ring. However, if it no longer looks good, you should replace it.
  • Even if you reuse the old flange, a new wax ring must be installed.
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Image titled Replace a Toilet Flange Step 11

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Hire a repairman if it is a glued or cast iron flange. If the flange is not PVC and is also not attached to the outlet pipe with a rubber washer, then you have 2 other options. It can be made of PVC but glued to the PVC outlet, or made of cast iron and fitted to the outlet pipe also of cast iron. In both of these cases, you should call a mechanic to have them fix it.

  • If the flange is PVC but is glued to the inside or outside of the PVC outlet pipe, you will need to use a chisel and/or drill to remove it. If you damage the drain pipe in the process, the repair cost will be very expensive. [10] X Research Source
  • If the old flange is made of cast iron and connects to the cast iron outlet pipe, you will have to use a chisel and rubber hammer to meticulously chisel at the edge of the flange. Similarly, if you damage the drain, the repair cost is quite high. [11] X Research Source

Buy the correct replacement flange

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Image titled Replace a Toilet Flange Step 12

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Measure the inside diameter of the outlet pipe. Usually the diameter of the pipe is 10 cm. Record the diameter measurements for reference when purchasing new flanges. [12] X Research Source

  • If you can bring your old flange to the utility, this number is for backup purposes only. However, if the old flange is broken then you should definitely have this measurement.
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Image titled Replace a Toilet Flange Step 13

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Take the old flange to the hardware store to buy a similar one. Purchase a new flange with the same size and shape as the old one as possible. That way you can make sure it fits snugly into the drain. [13] X Research Source

  • If you can’t find the right flange or need help in general, ask the shop owner.
  • If you do not have an old flange, purchase a new flange with the size of the outlet pipe you have measured.
Image titled Replace a Toilet Flange Step 14

Image titled Replace a Toilet Flange Step 14

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Buy a new flange-fit wax ring. Some flange sets are sold with wax rings, but sometimes you have to buy them separately. In any case, you must purchase a new flange-fit wax ring. [14] X Research Source

  • Instead of being made from wax, people now also produce rubber washers. However, you can install the rubber washer in the same way as you would a wax ring.

Install new flanges and wax rings

Image titled Replace a Toilet Flange Step 15

Image titled Replace a Toilet Flange Step 15

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Insert the supplied screws into the new flange. Take the nuts and bolts aside for a little while to install. The flange edge will have holes on each side for you to insert 2 bolts into it. Position the bolts so that they are pointing straight up and facing each other. [15] X Research Source

  • If you lose new bolts, you can reuse the old flange bolts, provided they are in good condition.
Image titled Replace a Toilet Flange Step 16

Image titled Replace a Toilet Flange Step 16

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Push the flange into the outlet pipe. The flange edge will lie flush with the floor on the entire perimeter, while the flange neck slides snugly into the outlet pipe. Position the flange so that the two bolts protrude at 3 o’clock and 9 o’clock (assuming the back of the toilet is at 12 o’clock). [16] X Research Source

  • The flange neck will have a rubber seal to seal the inside of the outlet pipe.
  • If the flange edge does not lie flat on the floor, the floor may be warped or damaged by water. You should have your bathroom floor repaired (or have it cleaned by a professional) before continuing with the toilet installation.
Image titled Replace a Toilet Flange Step 17

Image titled Replace a Toilet Flange Step 17

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Screw to connect the flange to the floor. Use a screwdriver (turn clockwise) to tighten the screws that come with the new flange. There will be pre-drilled holes on the flange edge for you to screw into. [17] X Research Source

  • Use a drill to make new screw holes in the floor if needed.
  • The old holes are located in the same location, but may be too large for new screws. If so, use a rubber hammer to drive the plastic stopper into the holes, then screw the screw through the hole in the flange and into the socket.
  • Flanges are usually secured with 4 screws, but can be more or less.
Image titled Replace a Toilet Flange Step 18

Image titled Replace a Toilet Flange Step 18

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Remove the towel or shirt from the drain. Pick up any broken pieces of wax rings, nuts or bolts before pulling out the scarf or shirt. Otherwise they may fall into the tube. [18] X Research Sources

  • Don’t reuse this scarf or shirt – throw it away!
Image titled Replace a Toilet Flange Step 19

Image titled Replace a Toilet Flange Step 19

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Tilt the toilet to put the new flute ring in place. Press the wax ring over the stem of the tube that surrounds the hole in the bottom of the toilet bowl. Press firmly on the entire circumference of the wax ring but do not deform it. [19] X Research Source

  • Professionals like to install wax rings this way to ensure a good seal around the toilet bowl. However, you can also place the wax ring on top of the flange, and then place the toilet on it. [20] X Research Source
  • If you’re using the new “wax ring,” which is actually a rubber seal, place the round side over the flange and place the toilet on it.
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Install the toilet in the right position

Image titled Replace a Toilet Flange Step 20

Image titled Replace a Toilet Flange Step 20

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Place the toilet on the flange. Align so that the 2 holes in the base of the toilet go into the 2 bolts that bud onto the flange. Once the toilet is on the flange, press firmly near the back of the toilet to deform the wax ring and seal the joint. [21] X Research Source

  • You must do this step regardless of whether you have previously pressed the wax ring to the bottom of the toilet bowl or placed it on top of the flange.
Image titled Replace a Toilet Flange Step 21

Image titled Replace a Toilet Flange Step 21

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Install the washers and nuts into the bolts. Install the plastic washer on the bolts first, then the metal washer. Then, manually turn the nuts clockwise before tightening them with a wrench. [22] X Research Source

  • If there are plastic caps, put them on top of the bolts. However, if the bolt is too long, use a hacksaw to cut it so that the plastic cover fits snugly on top.
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Image titled Replace a Toilet Flange Step 22

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Reattach the water supply pipe. Manually screw the fitting at the end of the water supply line to the connector on the underside of the drain tank. Use a wrench or pliers to tighten if necessary. [23] X Research Sources

  • Plastic couplings are usually manufactured to be hand-tightened, while metal couplings must be screwed with a wrench or pliers.
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Image titled Replace a Toilet Flange Step 23

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Turn on the water supply to the drain. Turn the oval valve counterclockwise to reopen the water supply. You will hear the sound of water running into the tub. [24] X Research Source

  • While water is entering the tank, check for leaks at the connection between the water supply line and the tank.
  • Image titled Replace a Toilet Flange Step 24

    Image titled Replace a Toilet Flange Step 24

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    Flush several times to check for leaks. Carefully inspect the floor around the base of the toilet. If the floor is dry then your job is done. If you see water seeping out, you need to remove the toilet and redo it, or hire a repairman. [25] X Research Sources
  • Advice

    • After removing the toilet, if you find that the flange is fine but there is a leak at the base of the toilet, just replace the wax ring with a new one and check it again.

    Warning

    • Do not tighten the nut connecting the toilet bowl to the flange too tightly. Tightening can cause the porcelain to crack.

    Things you need

    • Newspaper or rag
    • Wrench
    • Plaster knife
    • Screwdrivers
    • Tape measure
    • Towels or old shirts
    • New Flange
    • New wax ring
    X

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    The toilet flange connects the bottom of the toilet bowl to the drain on the toilet floor. When the toilet has a leak under your feet, you may need to replace the toilet flange. After lifting the toilet from the flange, you will find that replacing the flange is not too difficult, but in some cases it may be a good idea to hire a plumber.

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