Replacing a float in a toilet is a straightforward DIY repair that stops your toilet from running constantly. To replace a float in a toilet, you first need to identify the type of float—either a traditional float ball or a modern float cup—and then follow a few simple steps. This guide will walk you through the process, saving you money on water bills and preventing potential water damage. The U.S. Environmental Protection Agency's WaterSense program notes that a running toilet can waste up to 200 gallons of water per day (EPA WaterSense), making prompt repairs both eco-friendly and economical.
Understanding Toilet Floats
Toilet floats are part of the fill valve assembly. They control when the water shuts off after a flush. There are two common types:
| Type | Mechanism | Pros | Cons |
|---|---|---|---|
| Float Ball | A hollow ball attached to a metal arm that rises with the water level. | Simple design, easy to adjust. | Can get stuck or corroded; arm may bend. |
| Float Cup | A cylindrical cup that slides up and down the fill valve shaft. | More reliable, less prone to sticking. | May require replacement of the entire fill valve. |
Most modern toilets use a float cup design. However, older models often still use a float ball. Knowing which type you have will help you purchase the correct replacement part.
Tools and Materials Needed
- Adjustable wrench or pliers
- Flathead screwdriver
- Bucket or towel (to catch residual water)
- Replacement float (float ball or float cup, depending on your toilet)
- Optional: replacement fill valve if the old one is damaged
Most hardware stores carry universal float kits that fit a wide range of toilets. Check the manufacturer's specifications for your toilet model if you are unsure.
Step-by-Step Guide to Replace a Float
Step 1: Turn Off the Water Supply
Locate the shut-off valve behind the toilet (usually under the tank). Turn it clockwise until it stops. Flush the toilet to empty the tank. Use a bucket or towel to soak up any remaining water at the bottom of the tank.
Step 2: Disconnect the Old Float
For a float ball: unscrew the nut connecting the float arm to the fill valve. The arm will come free. For a float cup: you may need to unclip the cup from the fill valve shaft or remove a retaining clip. Refer to the official Fluidmaster documentation for specific instructions if you have a Fluidmaster valve.
Step 3: Install the New Float
Attach the new float according to its design. For a float ball, screw the arm back onto the fill valve. For a float cup, slide it onto the shaft and secure with the clip. Ensure it moves freely without binding.
Step 4: Adjust the Float Height
Turn the water supply back on and let the tank fill. The water level should be about 1 inch below the top of the overflow tube. Adjust the float: for a float ball, bend the arm slightly; for a float cup, turn the adjustment screw on the fill valve. The EPA recommends setting the water level to prevent water from entering the overflow tube to avoid waste.
Step 5: Test for Leaks
After adjustment, flush the toilet and watch the refill. Ensure the float stops the water at the correct level. Check for any drips around the fill valve. If the toilet continues to run, you may need to replace the entire fill valve. For more help, see our toilet repair service.
Common Problems and Troubleshooting
Even after replacing the float, you might encounter issues:
- Toilet still runs: The fill valve may be worn out. Consider replacing it.
- Float sticks: Check for mineral deposits or misalignment. Clean the shaft or adjust the float.
- Water level too high: The float may be set too high. Adjust downward.
- Water level too low: Adjust the float upward or check for a clog in the fill valve.
Persistent leaks may indicate a more serious problem, such as a cracked overflow tube or a damaged flapper. Our leak detection specialists can diagnose hidden issues.
When to Call a Professional
While replacing a float is a common DIY task, some situations warrant calling a licensed plumber. If you are uncomfortable working with water supply lines, if the toilet is old and other parts are failing, or if you suspect a larger plumbing issue like a main water leak, it's best to seek expert help. The International Association of Plumbing and Mechanical Officials (IAPMO) emphasizes the importance of proper installation to meet local plumbing codes. You can learn more about plumbing standards at IAPMO's official site.
Frequently Asked Questions
Q: What causes a toilet float to fail?
A: Floats can fail due to age, mineral buildup, corrosion, or physical damage. A punctured float ball will fill with water and stop floating, causing the toilet to run constantly.
Q: How much does it cost to replace a toilet float?
A: The float part typically costs between $10 and $30. If you hire a plumber, labor adds $100 to $200, though prices vary by region. Doing it yourself saves the labor cost.
Q: Can I replace just the float or do I need a new fill valve?
A: If the fill valve is in good condition, you can replace only the float. However, if the valve is old or leaking, it's often more cost-effective to replace the entire fill valve assembly.
Q: How long does a toilet float last?
A: With proper maintenance, a toilet float can last 5 to 10 years. Hard water can shorten its lifespan.
Q: Why does my toilet keep running after replacing the float?
A: The issue may be a worn flapper, a misadjusted float, or a faulty fill valve. Double-check the float height and inspect the flapper. Our pipe repair team can help if the problem persists.
Q: Is replacing a toilet float a DIY job?
A: Yes, most homeowners with basic tools can do it. Always turn off the water supply first. If you encounter any difficulties, call a professional.
If you're not comfortable performing this repair yourself, or if the problem persists, our team at MyTownPlumber is ready to help. Contact us for professional toilet repair services.
By MyTownPlumber Editorial Team