I believe a mobile home has to be less than 10, (but it could be 12), years old. If yours is, call 1-800-356-3496 and put in a claim to have it replaced. They will replace it with CPVC, unless you wish to pay extra and install copper. In a mobile home, I have no problem with them using CPVC piping. I would not recommend it in a house however.: What if anything can I do about the polybutylene plumbing pipe in my mobile home? : I am shrouded with leaks in this system