How to Fix a Toilet Flapper That Won’t Seal Properly

Toilet Flapper Not Sealing? Here’s How to Fix It

A faulty toilet flapper can waste water, raise your bills, and lead to toilet damage. This small rubber part controls water flow from the tank to the bowl—so when it fails, the toilet keeps running.

Common Flapper Issues

1. Worn-Out Flapper
Rubber can crack or warp over time, breaking the seal.

2. Mineral Build-Up
Hard water deposits can block the flapper from sealing tightly.

3. Chain Too Tight or Too Loose
A tangled or poorly adjusted chain can stop the flapper from sealing or make it close too quickly.

4. Flush Valve Problems
If the flush valve is cracked or uneven, the flapper won’t sit flat.

5. Improper Installation
If the flapper isn’t aligned correctly, it won’t close properly.

DIY Fixes for a Flapper That Won’t Seal

• Replace the flapper if it’s old or cracked.

• Soak and scrub the flapper with vinegar to remove mineral buildup.

• Adjust the chain for proper slack.

• Inspect the valve seat and sand smooth if needed.

• Always ensure proper installation.

Professional Toilet Repairs by SEBPOL LLC

If your toilet still won’t seal, SEBPOL LLC offers expert plumbing repairs to get things flushing smoothly again. Don’t waste water—call us today.