I own a 19-year-old, 1200 sq ft, frame house that we rent out. The home has polybutylene plumbing and has had two leaks recently. One required breaking into the concrete slab, the other into a wall for repairs. The breaks are definitely an annoyance and inconvenience to the renters and costly for me. The current occupant has requested release from the lease, so it would be good timing to do a replacement between occupants. What is your advice on having the polybutylene plumbing replaced?