When buying a home you should make an inquiry to the seller or home inspector whether there was previously polybutylene pipe or tubing in the home that was replaced. Or, you may notice that polybutylene pipe was replaced inside the home yourself.
This is evident when you notice a coupling or connection on an exterior wall that is copper pipe connected to the poly tubing. If it is the case that the polybutylene was replaced inside the home it may not have been replaced outside and this type of supply line tubing is defective.
You can save yourself the cost of the replacement of your water supply line in your new home prior to your purchase by calling Amercan Plumbing for a free inspection of the water service line from the street into your new home.