Inspect toilet supply lines for drips, corrosion, kinks, bulges, and loose connections. The line is small, but it is connected to pressurized water, so a failure can keep leaking until someone shuts it off.
What to check
- Water at the floor near the toilet shutoff valve.
- Corrosion or mineral crust on the valve or connector.
- Kinks, bulges, cracks, or fraying on the hose.
- A valve that won't turn smoothly.
- A connector that drips after flushing or cleaning.
How to inspect it
- Flush the toilet and watch the line while the tank refills.
- Touch connections with a dry paper towel.
- Check the shutoff valve handle and stem for moisture.
- Look at the floor and base trim nearby.
- Don't overtighten parts to chase a leak.
Fluidmaster installation guidance tells users to turn water on slowly and check for leaks at the shutoff valve. That same idea applies to inspections: look calmly, dry things off, then verify where the water returns.
When to replace it
Replace the supply line if it is cracked, kinked, corroded, leaking, or old enough that you don't trust it. Use the right length and connector type for your toilet and valve.
When to call a plumber
Call a plumber if the shutoff valve leaks, won't close, is heavily corroded, or if the floor around the toilet is soft. The hose may not be the only problem.
Good maintenance rhythm
- Inspect toilet supply lines every 6 months, after any toilet repair, and before leaving the house empty for a long trip.