The $15 Water Line That Can Prevent a $50,000+ Insurance Claim Most homeowners think about replacing a roof, servicing an HVAC system, or maintaining a water heater. Very few think about the small water supply line connected to the back of a toilet—until it fails. Unfortunately, when a toilet supply line bursts, the results can be devastating. The photos below from my own father's home show the aftermath of a toilet supply line failure. What started as a small plumbing component failure turned into extensive water damage requiring demolition of drywall, insulation, ceilings, flooring, and portions of the home's structure. Water remediation equipment, reconstruction costs, and insurance claims quickly followed. Why Toilet Supply Lines Fail The flexible water supply line connecting your toilet to the shutoff valve is under constant pressure 24 hours a day, 365 days a year. Over time, these lines can deteriorate due to: Age and material breakdown Mineral buildup from ...