Toilet supply line broke at the plastic tank valve female end overnight. Ruined two bathrooms (vanities, doors, drywall, etc), two bedrooms with hardwood floors and it wiped out the cabinets in the laundry room. $40k paid out by insurance (thank heavens my agent got me into a good policy with full water coverage). From what i've been reading this type of break is fairly common and always at the plastic end. Doing some research anything you find at home depot or lowes has the plastic end. There are a couple i found on Amazon of all places that have the tank end in metal with very mixed reviews (one several people claim actually is plastic but painted to look metal). So it seems for whatever reason 99% of these supply lines are plastic on the tank end. Why? Clearly it's a **** design that can lead to a break and severe property damage. What is the recommendation for best toilet supply line? Thanks in advance for any advice.