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How To Replace A Toilet: A Step-By-Step Guide

Replacing a toilet might sound like an intimidating task, but with the right tools, knowledge, and a bit of patience, you can do it yourself. This guide will walk you through every step, ensuring a hassle-free and successful installation. Whether you’re updating an old fixture or installing a new one for the first time, this article has you covered.


Tools and Materials You’ll Need:

Before you begin, gather the following tools and materials:

  • Adjustable wrench

  • Screwdriver (flathead and Phillips)

  • Bucket or container

  • Sponge or towels

  • Putty knife

  • Wax ring or rubber gasket

  • Toilet bolts and caps

  • Level

  • Silicone caulk

  • New toilet

  • Supply line (if needed)




Having everything ready will save time and prevent unnecessary trips to the hardware store.


Step 1: Preparation

  1. Turn Off the Water Supply: Locate the shutoff valve behind or near the toilet. Turn it clockwise to stop the water flow. Flush the toilet to empty the tank and bowl. Use a sponge or towels to soak up any remaining water.

  2. Disconnect the Supply Line: Use an adjustable wrench to loosen and remove the supply line connecting the toilet tank to the water source. Place a bucket beneath to catch any residual water.


Step 2: Remove the Old Toilet

  1. Unscrew the Bolts: Pry off the bolt caps at the base of the toilet. Use a wrench to unscrew the nuts from the floor bolts. If they are rusted or stuck, apply a penetrating oil and give it a few minutes to loosen.

  2. Lift the Toilet: Rock the toilet gently back and forth to break the seal of the wax ring. Once loose, lift the toilet straight up and place it on an old towel or cardboard to avoid mess.

  3. Remove the Wax Ring: Scrape off the old wax ring from the flange using a putty knife. Be thorough to ensure a clean surface for the new seal.

  4. Inspect the Flange: Check the toilet flange for damage. If it’s cracked or broken, replace it before installing the new toilet.


Step 3: Install the New Toilet

  1. Prepare the New Toilet: If the tank and bowl are separate, attach them according to the manufacturer’s instructions. Ensure the tank bolts are secure but not overtightened.

  2. Install the Wax Ring: Place a new wax ring or rubber gasket on the base of the toilet. Some people prefer attaching it to the flange instead—either method works.

  3. Position the Toilet: Carefully lower the toilet onto the flange, aligning the bolts with the holes in the base. Press down firmly to compress the wax ring and create a watertight seal.

  4. Secure the Toilet: Tighten the nuts onto the floor bolts. Alternate tightening each side to avoid cracking the porcelain. Cover the bolts with caps for a finished look.


Step 4: Reconnect the Water Supply

  1. Attach the Supply Line: Reconnect the water supply line to the fill valve on the tank. Tighten it by hand, then give it a quarter turn with a wrench for a snug fit. Be careful not to overtighten.

  2. Turn On the Water: Open the shutoff valve slowly to let water fill the tank. Check for leaks around the supply line and base.

  3. Test the Toilet: Flush the toilet several times to ensure everything is functioning properly. Check for leaks around the base and connections.


Step 5: Final Touches

  1. Level the Toilet: Use a level to ensure the toilet is even. If it wobbles, insert plastic shims at the base and trim the excess.

  2. Seal the Base: Apply a thin bead of silicone caulk around the base of the toilet where it meets the floor. This prevents water from seeping underneath and adds a polished appearance.


Tips for Success:

  • Work Safely: Toilets can be heavy, so consider enlisting help if needed.

  • Check Local Codes: Some areas have specific plumbing codes. Ensure your installation complies.

  • Dispose Properly: Take the old toilet to a recycling facility or dispose of it according to local regulations.

  • Choose Quality Materials: Invest in a high-quality wax ring and supply line to avoid future leaks.


Troubleshooting Common Issues

  • Leak Around the Base: This usually indicates a faulty wax ring. Remove the toilet, replace the ring, and reseat it.

  • Wobbling Toilet: Use shims to stabilize the toilet and tighten the bolts securely.

  • Weak Flush: Check the water level in the tank or inspect the fill valve for proper operation.


Replacing a toilet may seem daunting, but it’s a straightforward process when broken into manageable steps. With the right tools and careful attention to detail, you can save money on professional installation and enjoy the satisfaction of completing a DIY project. Whether you’re upgrading for style, efficiency, or functionality, following this guide will ensure a smooth and successful replacement. Happy plumbing!

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