how to replace guts in toilet

Daniel Parker

2 min read

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11-01-2025

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Replacing your toilet's internal parts, often called the "innards" or "guts," is a manageable DIY project that can save you money on plumbing bills. This comprehensive guide will walk you through the process, step by step. Before you begin, remember safety first! Turn off the water supply to the toilet.

What You'll Need

Before starting, gather these essential tools and materials:

• New toilet fill valve: This controls the water filling the tank.
• New flapper: This seals the opening at the bottom of the tank, controlling water flow to the bowl.
• Screwdrivers (Phillips and flathead): For removing and installing parts.
• Pliers: For tightening connections.
• Bucket: To catch leftover water.
• Adjustable wrench (optional): For stubborn connections.
• Old towels or rags: To protect the floor and absorb spills.
• Flashlight: To illuminate the tank's interior.
• Pen or marker: To mark the fill valve height (if necessary).

Step-by-Step Guide to Replacing Toilet Guts

Here's a detailed walkthrough of the process:

1. Turn Off the Water Supply: Locate the shut-off valve behind the toilet and turn it clockwise until it stops. Flush the toilet to empty the tank as much as possible.

2. Drain the Remaining Water: Use a bucket or sponge to remove any remaining water from the tank.

3. Remove the Old Fill Valve: The fill valve is usually located at the back of the tank. Unscrew the nuts or clips securing it to the tank. Carefully remove the valve, noting its position and how it connects.

4. Remove the Old Flapper: The flapper is located at the bottom of the tank. It's usually attached with a chain to the flush handle. Detach the chain, and lift off the old flapper. Take a picture if you’re unsure about the re-installation.

5. Install the New Fill Valve: Position the new fill valve in the same location as the old one. Secure it with the nuts or clips. Ensure it's properly aligned.

6. Install the New Flapper: Carefully attach the new flapper to the flush valve opening. Attach the chain to the flush handle, making sure it's not too tight or too loose. A slightly loose chain allows for a more complete flush.

7. Reassemble and Test: Carefully reassemble any other parts removed during the process. Turn the water supply back on. Listen for any leaks and check for proper water level in the tank. Flush the toilet several times to ensure everything is working correctly.

8. Addressing Leaks: If you notice any leaks, check all connections for tightness and ensure all parts are properly sealed. If the leak persists, you might have to re-check your work or consider seeking professional help.

Troubleshooting Common Issues

• Toilet runs constantly: This usually indicates a faulty flapper. Replacing the flapper is typically the solution.
• Toilet fills too slowly or too quickly: This suggests an issue with the fill valve. A replacement valve is usually needed.
• Low water level in the tank: This points to a problem with the fill valve or the water supply itself.

When to Call a Professional

While replacing toilet guts is generally a straightforward task, it's crucial to know when to seek professional assistance. If you encounter any significant difficulties or are uncomfortable working with plumbing, it's best to call a qualified plumber. This will prevent potential damage and ensure the job is done correctly.

By following this step-by-step guide, you can successfully replace your toilet's internal parts and save money on costly repairs. Remember to always prioritize safety and don't hesitate to call a professional if needed. Replacing toilet guts is a rewarding DIY project for many, adding to your home maintenance skills.