You and I have come across PVC that has gone from white to many colored shades: from light yellow to tan to almost looking like ABS black. Should PVC schedule 40 pipe and fittings ... really frighten ...

UL-listed vent pipes and accessories are engineered systems ... the components are made from a certified compound PVC that is unlike DWV PVC, foam core PVC or foam core ABS. The soon-to-be ...