How to Replace a Toilet Supply Line

Water leaks at the toilet supply line are common but simple to fix before they escalate into warped subflooring or rot. A standard toilet supply line should be replaced every ten years or whenever you notice corrosion, bulging, or mineral buildup on the hose exterior. Performing this repair requires only basic hand tools and a few minutes of your time. By choosing a high-quality braided stainless steel line, you ensure the connection is burst-resistant and far more durable than the rigid plastic or copper lines of the past. Focus on clean threads and a proper seal to ensure a drip-free installation that lasts a decade.

1. Stop the water flow. Locate the shut-off valve behind the toilet and turn it clockwise until it stops. Flush the toilet to drain the tank and clear residual water from the line.
2. Unscrew the old connector. Use an adjustable wrench to loosen the nut at the base of the toilet tank first. Once loose, unscrew the nut at the water shut-off valve.
3. Inspect threads for damage. Wipe the threads on the shut-off valve and the toilet fill valve with a dry rag. Ensure there is no old plumber's tape or mineral deposits left behind.
4. Connect the new supply line. Hand-tighten the new braided supply line to the tank inlet first, then attach the other end to the shut-off valve. Ensure the rubber gaskets inside both ends are seated flat against the threads.
5. Secure without overtightening. Use your wrench to turn the nut an additional quarter-turn past hand-tight. Do not overtighten, as this can crack the plastic threads on the tank fill valve.
6. Verify the seal holds. Turn the shut-off valve counter-clockwise slowly to restore water pressure. Watch both connection points for at least five minutes for any signs of weeping.