Poly-B plumbing came in from 1978 to 1995. Grey and flexible and has identifying marks. About 1/3 of Calgary homes have this piping today. Over 750,000 Canadian homes have Poly-B. Poly-B plumbing has known issues with pin-hole leaks and brittle fittings. It is no longer used. WHAT IS USED TODAY PEX is used today and…