
A leaking toilet is often caused by a faulty pan collar seal, which is also known as a toilet pan connector or rubber gasket. The pan collar seal ensures a watertight connection between the toilet pan and the waste pipe. To replace the pan collar rubber, you will need to remove the toilet pan from its location and then remove the old pan collar seal. Once the new seal is installed and the toilet pan is replaced, you can test the toilet by flushing it several times to ensure the new pan collar seal is functioning correctly.
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What You'll Learn

Removing the old pan collar seal
Before removing the old pan collar seal, make sure to turn off the water supply by locating the shut-off valve behind the toilet. Flush the toilet to drain the water from the cistern and pan. Use a sponge and bucket to remove any remaining water in the toilet bowl. Disconnect the water supply line from the toilet cistern using an adjustable wrench.
Now, let's begin the process of removing the old pan collar seal. First, locate the pan collar seal on the waste pipe. Carefully observe its position and orientation before attempting to remove it. This will help you understand how the new seal will be installed. Put on gloves if you haven't already, as the next step involves pulling off the old rubber seal. Use some force if necessary, but be careful not to damage any other components.
After removing the rubber seal, you should also remove the white plastic retainer ring, which sits on top of the seal. With the old seal and retainer ring removed, take some time to clean the area around the waste pipe and toilet pan outlet. This step is crucial to ensuring a proper seal when installing the new components. You can use an all-purpose cleaner or a mild detergent to clean the area, but make sure it is suitable for use on plumbing fixtures and won't damage the components.
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Installing the new pan collar seal
Firstly, apply plumber's tape around the waste pipe where the new seal will be installed. Then, fit the new toilet pan collar seal onto the waste pipe, ensuring it is securely in place and properly aligned.
Next, carefully lower the toilet pan back onto the waste pipe, aligning it with the new pan collar seal. Secure the toilet pan to the floor using bolts and ensure it is level and stable.
Once the toilet pan is in place, reconnect the water supply line to the toilet cistern using an adjustable wrench. Turn on the water supply and check for any leaks around the connections and the base of the toilet.
Finally, test the toilet by flushing it several times to ensure the new pan collar seal is functioning correctly and that there are no leaks. Check around the base of the toilet and the waste pipe for any signs of water.
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Reinstalling the toilet pan
Reinstalling a toilet pan is a relatively straightforward task that can be done in a few hours. Here is a detailed, step-by-step guide on how to do it:
Preparation:
Before beginning the installation, it is important to gather the necessary tools and materials. Some basic hand tools will be required, such as a screwdriver, pliers or an adjustable wrench, a hacksaw, a utility knife, a putty knife, a damp rag or sponge, and a spirit level. It is also important to wear protective gear, such as rubber gloves and knee pads.
Removing the Old Toilet:
Firstly, turn off the water supply at the shut-off valve, which is usually located on the wall or floor near the toilet. Flush the toilet to drain the water from the tank and bowl. Use a plunger to force any remaining water down the drain line, and then remove any residual water from the tank with a sponge and bucket while wearing rubber gloves.
Next, pop open the toilet bolt caps with a screwdriver, if necessary. Remove the nuts and washers securing the bowl to the floor using pliers or an adjustable wrench. If the nuts are rusted, use a heavy-duty lubricant to loosen them. Turn the screws to create space at the base of the bolts, and then use a hacksaw to cut the bolts off. If the toilet is caulked around the base, use a utility knife to score through the caulk seam. Gently rock the toilet bowl to work it free, and then lift and move it to the side to expose the old toilet seal.
Installing the New Toilet Pan:
Now, it's time to install the new toilet pan. First, ensure that the area where the toilet pan will be installed is clean and dry. Install the pan connector into the soil pipe using silicone lubricant. Spread the lubricant onto the end of the pan connector with your finger, and then insert the small end into the soil pipe in the wall.
Place the toilet into position by pushing the piped part at the back of the toilet into the pan connector. Use a spirit level to ensure the cistern is straight, and then mark the holes on the wall where the cistern will connect. Drill holes in the wall at these markings, and then reposition the toilet. Screw the cistern into place according to the drilled holes, using an impact driver to ensure the screws are tight. Use the impact driver to screw screws through the holes at the bottom of the pan to secure it in place.
Final Steps:
Once the toilet is secured to the wall and floor, install the flexi pipe by connecting it to the cold water supply and the toilet inlet valve. Tighten the nuts provided with a spanner. Check that all the fittings are tight, and then install the toilet lid. Place the flush through the appropriate hole in the lid and tighten the nut at the bottom of the flush mechanism by hand. Pop the lid onto the toilet and test the flush button. Finally, connect the toilet seat by joining the connections to the tab on the seat.
Reinstalling a toilet pan requires careful attention to detail, but with the right tools and guidance, it can be a rewarding DIY project.
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Using baby powder to lock the collar into place
To replace the pan collar rubber, you will first need to remove the toilet pan from its location. This can be a challenging task as toilets are either screwed and siliconed down to the floor or concreted down. Once the toilet is removed, you will have access to the pan connector collar.
The next step is to remove the white plastic retainer ring and the old rubber seal. Put on gloves if you haven't already and carefully pull off the seal. Now, you can install the new rubber seal. One useful technique to lock the collar into place is to use baby powder. Simply apply a small amount of baby powder to the rubber set, allowing the plastic locking collar to slide over the rubber wall and lock into place. Be careful not to use excessive force when installing the locking collar to avoid any damage.
After securing the rubber seal, place the retainer ring back on. Now, you can put the toilet pan back into position, ensuring it slides gently into the new rubber seal. Remember, the new rubber will be tight, so take your time and avoid using too much force. Once the toilet pan is in place, draw a light pencil line around the outside of the base, then remove the pan again. Finish by applying a bead of silicone, staying within the pencil lines.
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Testing the toilet for leaks
Now, you can conduct the food colouring test. For this test, you will need some food colouring, which you will add to the water in the tank. After 30 minutes, check the colour of the water in the toilet bowl. If any of the dye has made its way into the bowl, it indicates a leak at the flapper or a crack in the overflow tube. If there is a leak, you may be able to fix it yourself, especially if it is minor.
Check the flapper to ensure it is creating a proper seal. A faulty flapper can cause a continuous small stream of water to flow into the tank. If the leak is coming from the base of the toilet, try tightening the tee bolts on either side of the base using a wrench. This may restore the seal. If tightening the bolts does not work, the wax ring may need replacing.
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