PBT – flexible (usually gray or black) plastic pipe which is attached to barbed fittings and secured in place with a copper crimp ring. The primary manufacturer of PBT tubing and fittings was driven into bankruptcy by a class-action lawsuit over failures of this system. However, PB and PBT tubing has since returned to the market and codes, typically first for "exposed locations" such as risers.
We contacted Best Plumbing Service of Cincinnati to have the sump pump and the outlet pipes checked as our basement flooded recently and we were not sure whether the sump pump malfunctioned or the outlet pipe was blocked. Both plumbers did a fantastic job looking over the system, diagnosing, and fixing the problem. They were extremely honest, courteous , and professional. We are very pleased with their outstanding service and would very highly recommend Best Plumbing Service of Cincinnati. M Effat